diff --git a/src/api/studentTrainingAnswer.js b/src/api/studentTrainingAnswer.js
index 89d446d..107c812 100644
--- a/src/api/studentTrainingAnswer.js
+++ b/src/api/studentTrainingAnswer.js
@@ -149,6 +149,22 @@ export function checkProductDevelopmentProcessStepTwo(items) {
   });
 }
 
+export function checkProductDevelopmentProcessStepThree(payload) {
+  if (isStudentDemo()) {
+    const value = payload || {};
+    if (!String(value.ganttImageUrl || "").trim() || !/\.(png|jpe?g|webp|gif)$/i.test(String(value.ganttImageName || ""))) {
+      return Promise.reject(new Error("请上传甘特图图片（PNG、JPG、JPEG、WEBP 或 GIF）"));
+    }
+    return Promise.resolve({ code: 200, data: { valid: true, message: "校验通过" } });
+  }
+  return request({
+    url: "/api/student-training-answers/product-development-process/step-3/validate",
+    method: "post",
+    data: payload,
+    headers: { repeatSubmit: false },
+  });
+}
+
 function validateNewProductSurveyStepTwoDemo(form) {
   const value = form || {};
   const images = Array.isArray(value.images) ? value.images : [];
diff --git a/src/views/foundation/product-development-process.vue b/src/views/foundation/product-development-process.vue
index 075a444..1eba979 100644
--- a/src/views/foundation/product-development-process.vue
+++ b/src/views/foundation/product-development-process.vue
@@ -87,6 +87,38 @@
               <button type="button" class="btn-nav" :disabled="checking" @click="resetStepTwo"><el-icon><RefreshLeft /></el-icon>清空本步</button>
             </div>
           </template>
+          <template v-else-if="currentStep === 3">
+            <div class="step-title-row">
+              <div><p class="section-eyebrow">Step 03</p><h3>{{ trainingSteps[2] }}</h3></div>
+              <span class="step-chip">甘特图绘制</span>
+            </div>
+            <p class="process-intro">根据上表数据，使用工具绘制甘特图，并上传。</p>
+            <p v-if="!stepTwoPassed" class="step-warning">请先保存第 2 步项目排期，再上传甘特图。</p>
+            <section class="gantt-upload-panel">
+              <label class="gantt-upload-trigger" :class="{ disabled: !stepTwoPassed || uploadingGantt }">
+                <input type="file" accept="image/png,image/jpeg,image/webp,image/gif" :disabled="!stepTwoPassed || uploadingGantt" @change="uploadGanttImage" />
+                <el-icon><Upload /></el-icon>
+                <strong>{{ uploadingGantt ? '上传中…' : ganttImage.url ? '替换甘特图' : '上传甘特图' }}</strong>
+                <span>支持 PNG、JPG、JPEG、WEBP、GIF</span>
+              </label>
+              <figure v-if="ganttImage.url" class="gantt-preview">
+                <img :src="ganttImage.url" alt="已上传的甘特图" @click="previewGanttImage" />
+                <figcaption>{{ ganttImage.name }}</figcaption>
+              </figure>
+            </section>
+            <section class="gantt-guide">
+              <h4>推荐工具如下，自行选择作图工具：</h4>
+              <ol>
+                <li>Excel/WPS表格，利用堆积条形图制作，可参考《实训操作说明》完成。<button type="button" @click="downloadPracticeGuide">下载实训操作说明</button></li>
+                <li>下载Excel模板，填写关键信息，完成甘特图绘制。<button type="button" @click="downloadGanttTemplate">下载甘特图绘制模板</button></li>
+                <li>导出步骤二信息表，上传到通用AI绘图模型，通过大模型绘制甘特图。参考提示词：请根据产品WBS任务拆解与排期表生成甘特图用于后续项目管理。</li>
+              </ol>
+            </section>
+            <div class="task-actions">
+              <button type="button" class="btn-nav btn-submit" :disabled="uploadingGantt || !stepTwoPassed" @click="saveAndGoToStepFour">保存并进入第 4 步</button>
+              <button type="button" class="btn-nav" :disabled="uploadingGantt" @click="resetStepThree"><el-icon><RefreshLeft /></el-icon>清空本步</button>
+            </div>
+          </template>
           <div v-else class="step-placeholder"><p>第 {{ currentStep }} 步内容待配置</p><span>第 1 步答案已保存，可从上方步骤栏返回查看。</span></div>
         </section>
       </section>
@@ -102,8 +134,9 @@
 </template>
 
 <script setup>
-import { Download, Operation, RefreshLeft } from "@element-plus/icons-vue";
-import { checkProductDevelopmentProcessStepOne, checkProductDevelopmentProcessStepTwo, getStudentTrainingAnswer, saveStudentTrainingAnswer } from "@/api/studentTrainingAnswer";
+import { Download, Operation, RefreshLeft, Upload } from "@element-plus/icons-vue";
+import * as XLSX from "xlsx";
+import { checkProductDevelopmentProcessStepOne, checkProductDevelopmentProcessStepTwo, checkProductDevelopmentProcessStepThree, getStudentTrainingAnswer, saveStudentTrainingAnswer, uploadStudentTrainingFile } from "@/api/studentTrainingAnswer";
 import { getTrainingTaskByKey } from "@/api/trainingTask";
 import useUserStore from "@/store/modules/user";
 import TrainingAiSidebar from "@/views/components/TrainingAiSidebar.vue";
@@ -136,6 +169,9 @@ const checking = ref(false);
 const draftReady = ref(false);
 const checkResult = ref(null);
 const stepOnePassed = ref(false);
+const stepTwoPassed = ref(false);
+const ganttImage = ref({ url: "", name: "" });
+const uploadingGantt = ref(false);
 const taskTitle = computed(() => taskConfig.value?.taskName || defaultTask.title);
 const taskBackground = computed(() => taskConfig.value?.background || defaultTask.background);
 const taskGoals = computed(() => parseArray(taskConfig.value?.objectives, defaultTask.goals));
@@ -187,6 +223,8 @@ async function loadSavedAnswer() {
       clearDraft();
     }
     if (answer?.step2Answer) restoreStepTwoOutcome(answer.step2Answer);
+    if (answer?.step2Answer) stepTwoPassed.value = true;
+    if (answer?.step3Answer) restoreStepThreeOutcome(answer.step3Answer);
     const savedStep = Number(answer?.currentStep);
     if (Number.isInteger(savedStep) && savedStep > 0) currentStep.value = savedStep;
   } catch (error) {
@@ -220,6 +258,15 @@ function restoreStepTwoOutcome(value) {
   }
 }
 
+function restoreStepThreeOutcome(value) {
+  try {
+    const parsed = typeof value === "string" ? JSON.parse(value) : value;
+    ganttImage.value = { url: parsed?.ganttImageUrl || "", name: parsed?.ganttImageName || "" };
+  } catch (error) {
+    ganttImage.value = { url: "", name: "" };
+  }
+}
+
 function getLocalDraftKey() {
   const info = userStore.userInfo || {};
   return `${TASK_KEY}:draft:${info.userId || info.user_id || info.username || info.userName || "anonymous"}`;
@@ -236,7 +283,11 @@ function buildStepTwoOutcome() {
   };
 }
 
-function buildDraft() { return { step1: buildOutcome(), step2: buildStepTwoOutcome(), currentStep: currentStep.value }; }
+function buildStepThreeOutcome() {
+  return { title: taskTitle.value, ganttImageUrl: ganttImage.value.url, ganttImageName: ganttImage.value.name };
+}
+
+function buildDraft() { return { step1: buildOutcome(), step2: buildStepTwoOutcome(), step3: buildStepThreeOutcome(), currentStep: currentStep.value }; }
 
 function persistDraft() {
   if (!draftReady.value) return;
@@ -250,6 +301,7 @@ function loadDraft() {
       const draft = JSON.parse(raw);
       restoreOutcome(draft?.step1 || draft);
       if (draft?.step2) restoreStepTwoOutcome(draft.step2);
+      if (draft?.step3) restoreStepThreeOutcome(draft.step3);
       if (Number(draft?.currentStep) > 0) currentStep.value = Number(draft.currentStep);
     }
   } catch (error) { clearDraft(); }
@@ -296,6 +348,8 @@ async function resetTraining() {
   currentStep.value = 1;
   checkResult.value = null;
   stepOnePassed.value = false;
+  stepTwoPassed.value = false;
+  ganttImage.value = { url: "", name: "" };
   clearDraft();
   try {
     checking.value = true;
@@ -315,6 +369,7 @@ async function saveAndGoToStepThree() {
     await checkProductDevelopmentProcessStepTwo(buildStepTwoOutcome().items);
     await saveStudentTrainingAnswer(TASK_KEY, { step2Answer: JSON.stringify(buildStepTwoOutcome()), currentStep: 3, submitted: false, saveAction: "SAVE" });
     clearDraft();
+    stepTwoPassed.value = true;
     currentStep.value = 3;
     proxy?.$modal?.msgSuccess("已保存，已进入第 3 步");
   } catch (error) {
@@ -329,6 +384,98 @@ function resetStepTwo() {
   proxy?.$modal?.msgSuccess("已清空第 2 步填写内容");
 }
 
+async function uploadGanttImage(event) {
+  const file = event.target.files?.[0];
+  if (!file || !stepTwoPassed.value) return;
+  if (!/^image\/(png|jpeg|webp|gif)$/i.test(file.type)) {
+    proxy?.$modal?.msgError?.("请上传 PNG、JPG、JPEG、WEBP 或 GIF 格式的甘特图");
+    event.target.value = "";
+    return;
+  }
+  uploadingGantt.value = true;
+  try {
+    const formData = new FormData();
+    formData.append("file", file);
+    const response = await uploadStudentTrainingFile(formData);
+    ganttImage.value = {
+      url: response?.url || response?.fileName || "",
+      name: response?.originalFilename || file.name,
+    };
+    if (!ganttImage.value.url) throw new Error("上传结果缺少文件地址");
+    proxy?.$modal?.msgSuccess("甘特图上传成功");
+  } catch (error) {
+    ganttImage.value = { url: "", name: "" };
+    proxy?.$modal?.msgError?.(error?.message || "甘特图上传失败");
+  } finally {
+    uploadingGantt.value = false;
+    event.target.value = "";
+  }
+}
+
+async function saveAndGoToStepFour() {
+  if (uploadingGantt.value || !stepTwoPassed.value) return;
+  checking.value = true;
+  try {
+    await checkProductDevelopmentProcessStepThree(buildStepThreeOutcome());
+    await saveStudentTrainingAnswer(TASK_KEY, { step3Answer: JSON.stringify(buildStepThreeOutcome()), currentStep: 4, submitted: false, saveAction: "SAVE" });
+    clearDraft();
+    currentStep.value = 4;
+    proxy?.$modal?.msgSuccess("已保存，已进入第 4 步");
+  } catch (error) {
+    proxy?.$modal?.msgError?.(error?.message || "请先上传甘特图");
+  } finally {
+    checking.value = false;
+  }
+}
+
+function resetStepThree() {
+  ganttImage.value = { url: "", name: "" };
+  proxy?.$modal?.msgSuccess("已清空第 3 步上传内容");
+}
+
+function previewGanttImage() {
+  window.open(ganttImage.value.url, "_blank", "noopener,noreferrer");
+}
+
+function downloadPracticeGuide() {
+  const content = [
+    "产品开发甘特图实训操作说明",
+    "1. 使用第 2 步填写的任务编号、开始时间、完成时间和项目依赖关系建立任务表。",
+    "2. 在 Excel 或 WPS 中按日期轴创建堆积条形图；开始时间作为不可见基线，任务工期作为可见条形。",
+    "3. 为关键任务使用醒目颜色，并标注任务名称、开始及完成时间。",
+    "4. 导出或截图为 PNG/JPG 后上传至本步骤。",
+  ].join("\n");
+  downloadBlob(new Blob([content], { type: "text/plain;charset=utf-8" }), "产品开发甘特图-实训操作说明.txt");
+}
+
+function downloadGanttTemplate() {
+  const rows = processRows.value.map((row) => ({
+    阶段: row.stage,
+    任务编号: row.taskNo,
+    具体工作任务: row.task,
+    是否关键任务: row.classification,
+    开始时间: row.startDate,
+    完成时间: row.endDate,
+    项目依赖关系: row.dependency,
+  }));
+  const sheet = XLSX.utils.json_to_sheet(rows);
+  sheet["!cols"] = [{ wch: 16 }, { wch: 12 }, { wch: 32 }, { wch: 16 }, { wch: 14 }, { wch: 14 }, { wch: 24 }];
+  const workbook = XLSX.utils.book_new();
+  XLSX.utils.book_append_sheet(workbook, sheet, "甘特图任务表");
+  XLSX.writeFile(workbook, "产品开发甘特图绘制模板.xlsx");
+}
+
+function downloadBlob(blob, filename) {
+  const url = URL.createObjectURL(blob);
+  const link = document.createElement("a");
+  link.href = url;
+  link.download = filename;
+  document.body.appendChild(link);
+  link.click();
+  document.body.removeChild(link);
+  URL.revokeObjectURL(url);
+}
+
 function exportOutcome() {
   const blob = new Blob([JSON.stringify(buildDraft(), null, 2)], { type: "application/json;charset=utf-8" });
   const url = URL.createObjectURL(blob);
@@ -353,6 +500,7 @@ function exportOutcome() {
 .step-indicator { display: flex; align-items: center; gap: 12px; margin: 28px 0; padding: 12px; border: 1px solid rgba(30, 190, 255, .28); border-radius: 22px; }.step-tab { display: flex; align-items: center; flex: 1; gap: 10px; min-width: 0; padding: 10px; border: 0; border-radius: 16px; color: #96c6d8; background: transparent; text-align: left; cursor: pointer; }.step-tab.active { color: #fff; background: linear-gradient(110deg, #148fc6, #0879aa); }.step-marker { display: grid; place-items: center; flex: 0 0 42px; width: 42px; height: 42px; border: 1px solid #4ed7ff; border-radius: 50%; font-weight: 800; }.step-copy { display: grid; min-width: 0; gap: 4px; }.step-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }.step-action { font-size: 12px; color: #5ec9ed; }.step-connector { flex: 0 0 25px; height: 2px; background: rgba(83, 204, 255, .4); }
 .process-step-card { padding: 24px; border: 1px solid rgba(31, 185, 249, .32); border-radius: 18px; background: rgba(1, 21, 34, .65); }.step-title-row { display: flex; justify-content: space-between; align-items: flex-start; }.step-title-row h3 { margin: 5px 0 0; color: #fff; font-size: 24px; }.step-chip { border: 1px solid #38caff; border-radius: 999px; padding: 7px 12px; color: #9aeaff; }.process-intro { margin: 24px 0; line-height: 1.8; color: #c5e4ef; }.training-table-wrap { overflow-x: auto; }.process-table { width: 100%; min-width: 740px; border-collapse: collapse; color: #dff5ff; }.process-table th { padding: 14px; color: #fff; background: #079ed9; font-size: 16px; }.process-table td, .process-table th { border: 1px solid rgba(139, 213, 241, .45); text-align: center; }.process-table td { padding: 9px 12px; }.stage-cell { width: 16%; font-weight: 700; }.task-no-cell { width: 15%; }.task-cell { width: 37%; }.select-cell { width: 32%; }.select-cell select { width: 170px; max-width: 100%; padding: 6px 10px; border: 1px solid #6ea9bd; color: #132c36; background: #fff; font-size: 15px; }.classification-feedback { margin: 6px 0 0; color: #ff9b8f; font-size: 12px; }.is-correct { background: rgba(55, 196, 147, .08); }.is-incorrect { background: rgba(255, 91, 82, .1); }.classification-summary { margin: 16px 0 0; color: #ffbc86; }.classification-summary.is-success { color: #6ee8b1; }.task-actions { justify-content: center; margin-top: 26px; }.btn-submit { border-color: #36d9ff; background: linear-gradient(110deg, #0eaae4, #0572ac); font-weight: 700; }.btn-nav:disabled { opacity: .6; cursor: not-allowed; }.step-placeholder { padding: 90px 20px; text-align: center; color: #a8cfdd; }.step-placeholder p { color: #fff; font-size: 20px; }
 .step-warning { margin: 0 0 16px; padding: 10px 14px; border: 1px solid rgba(255, 173, 93, .62); border-radius: 8px; color: #ffd19f; background: rgba(187, 102, 27, .16); }.schedule-table { min-width: 1180px; }.schedule-table .stage-cell { width: 13%; }.schedule-table .task-no-cell { width: 9%; }.schedule-table .task-cell { width: 20%; }.classification-cell { width: 13%; font-weight: 700; }.schedule-table input { box-sizing: border-box; width: 150px; max-width: 100%; padding: 7px 8px; border: 1px solid #6ea9bd; color: #132c36; background: #fff; }.schedule-table .dependency-input { width: 190px; }.schedule-table input:disabled { cursor: not-allowed; opacity: .6; }
+.gantt-upload-panel { display: grid; justify-items: center; gap: 22px; min-height: 320px; padding: 32px 16px; border: 1px dashed rgba(71, 204, 255, .55); border-radius: 14px; background: radial-gradient(circle at center, rgba(15, 119, 163, .16), transparent 55%); }.gantt-upload-trigger { display: grid; place-items: center; align-content: center; gap: 9px; width: 280px; height: 138px; border-radius: 10px; color: #fff; background: linear-gradient(135deg, #0ba6e0, #0877ad); cursor: pointer; box-shadow: 0 14px 30px rgba(5, 126, 180, .24); }.gantt-upload-trigger input { position: absolute; width: 1px; height: 1px; opacity: 0; }.gantt-upload-trigger .el-icon { font-size: 26px; }.gantt-upload-trigger span { color: #cbefff; font-size: 12px; }.gantt-upload-trigger.disabled { cursor: not-allowed; opacity: .55; }.gantt-preview { width: min(100%, 760px); margin: 0; text-align: center; }.gantt-preview img { display: block; width: 100%; max-height: 410px; object-fit: contain; border: 1px solid rgba(84, 211, 255, .5); border-radius: 10px; background: #fff; cursor: zoom-in; }.gantt-preview figcaption { margin-top: 8px; color: #a8dce9; font-size: 13px; }.gantt-guide { margin-top: 26px; padding: 18px 22px; border-left: 3px solid #23c4ff; background: rgba(12, 75, 104, .22); color: #d4edf6; }.gantt-guide h4 { margin: 0 0 14px; color: #fff; }.gantt-guide ol { margin: 0; padding-left: 20px; }.gantt-guide li { margin: 11px 0; line-height: 1.7; }.gantt-guide button { margin-left: 12px; border: 0; border-radius: 6px; padding: 5px 10px; color: #fff; background: #109ed4; cursor: pointer; }
 @media (max-width: 1280px) { .product-process { grid-template-columns: 1fr; }.step-indicator { overflow-x: auto; }.step-tab { min-width: 190px; } }
 @media (max-width: 720px) { .product-process { padding: 12px; }.process-workbench { margin: 12px; padding: 14px; }.task-header { padding: 18px; }.workbench-actions { justify-content: flex-start; flex-wrap: wrap; }.step-title-row { gap: 12px; }.step-chip { display: none; } }
 </style>