diff --git a/src/api/studentTrainingAnswer.js b/src/api/studentTrainingAnswer.js
index 81238b7..b3cf55b 100644
--- a/src/api/studentTrainingAnswer.js
+++ b/src/api/studentTrainingAnswer.js
@@ -473,3 +473,22 @@ export function checkProductValuePositioningStepTwo(payload) {
     headers: { repeatSubmit: false },
   });
 }
+
+export function checkProductValuePositioningStepThree(payload) {
+  const statements = Array.isArray(payload?.statements) ? payload.statements : [];
+  const requiredFields = ["targetUser", "productName", "productCategory", "coreValue", "differentiationReason"];
+  if (isStudentDemo()) {
+    const valid = statements.length === 2 && statements.every((statement, index) => statement?.id === index + 1
+      && requiredFields.every((field) => Boolean(String(statement?.[field] || "").trim())));
+    return Promise.resolve({
+      code: 200,
+      data: { valid, message: valid ? "两版定位陈述填写完整。" : "请完整填写两个产品价值定位陈述版本。" },
+    });
+  }
+  return request({
+    url: "/api/student-training-answers/product-value-positioning/step-3/validate",
+    method: "post",
+    data: { statements },
+    headers: { repeatSubmit: false },
+  });
+}
diff --git a/src/views/product/differentiation.vue b/src/views/product/differentiation.vue
index feb1ece..c0afae2 100644
--- a/src/views/product/differentiation.vue
+++ b/src/views/product/differentiation.vue
@@ -149,32 +149,22 @@
               <h3>{{ activeStepName }}</h3>
             </div>
           </div>
-          <div class="step-content value-grid">
-            <label class="field-block">
-              <span>客户任务：</span>
-              <textarea v-model="form.valueCanvas.customerJobs" />
-            </label>
-            <label class="field-block">
-              <span>用户痛点：</span>
-              <textarea v-model="form.valueCanvas.pains" />
-            </label>
-            <label class="field-block">
-              <span>用户收益：</span>
-              <textarea v-model="form.valueCanvas.gains" />
-            </label>
-            <label class="field-block">
-              <span>产品与服务：</span>
-              <textarea v-model="form.valueCanvas.products" />
-            </label>
-            <label class="field-block">
-              <span>痛点缓解方案：</span>
-              <textarea v-model="form.valueCanvas.painRelievers" />
-            </label>
-            <label class="field-block">
-              <span>收益创造方案：</span>
-              <textarea v-model="form.valueCanvas.gainCreators" />
-            </label>
+          <div class="positioning-intro">
+            <p>根据前面实训分析，使用经典定位陈述格式撰写简洁有力的产品价值定位陈述。</p>
+            <p>经典定位陈述格式：对于【目标市场/用户】，我们的【产品名称】是一个【产品类别】，它能提供【核心价值/关键收益】，因为它具有【主要差异化理由】。</p>
           </div>
+          <article v-for="(statement, index) in form.positioningStatements" :key="statement.id" class="positioning-version-card">
+            <header><span>版本{{ numberToChinese(index + 1) }}</span><small>至少设计两个不同目标用户版本</small></header>
+            <p class="statement-preview">对于 <strong>{{ statement.targetUser || '【目标市场/用户】' }}</strong>，我们的 <strong>{{ statement.productName || '【产品名称】' }}</strong> 是一个 <strong>{{ statement.productCategory || '【产品类别】' }}</strong>，它能提供 <strong>{{ statement.coreValue || '【核心价值/关键收益】' }}</strong>，因为它具有 <strong>{{ statement.differentiationReason || '【主要差异化理由】' }}</strong>。</p>
+            <div class="positioning-fields">
+              <label><span>目标市场/用户</span><input v-model="statement.targetUser" :aria-label="`版本${index + 1}目标市场或用户`" placeholder="填写目标市场/用户" /></label>
+              <label><span>产品名称</span><input v-model="statement.productName" :aria-label="`版本${index + 1}产品名称`" placeholder="填写产品名称" /></label>
+              <label><span>产品类别</span><input v-model="statement.productCategory" :aria-label="`版本${index + 1}产品类别`" placeholder="填写产品类别" /></label>
+              <label><span>核心价值/关键收益</span><input v-model="statement.coreValue" :aria-label="`版本${index + 1}核心价值或关键收益`" placeholder="填写核心价值/关键收益" /></label>
+              <label class="positioning-fields__wide"><span>主要差异化理由</span><textarea v-model="statement.differentiationReason" :aria-label="`版本${index + 1}主要差异化理由`" placeholder="填写主要差异化理由" /></label>
+            </div>
+          </article>
+          <p v-if="positioningValidationMessage" class="core-pain-validation-message" role="status">{{ positioningValidationMessage }}</p>
         </section>
 
         <section v-show="isSectionVisible(4)" class="step-card">
@@ -257,7 +247,7 @@ import TrainingAiSidebar from "@/views/components/TrainingAiSidebar.vue";
 import TrainingMaterialButton from "@/views/components/TrainingMaterialButton.vue";
 import TrainingTaskBrief from "@/views/components/TrainingTaskBrief.vue";
 import { getTrainingTaskByKey } from "@/api/trainingTask";
-import { checkProductValuePositioningStepOne, checkProductValuePositioningStepTwo, getStudentTrainingAnswer, saveStudentTrainingAnswer, uploadStudentTrainingFile } from "@/api/studentTrainingAnswer";
+import { checkProductValuePositioningStepOne, checkProductValuePositioningStepTwo, checkProductValuePositioningStepThree, getStudentTrainingAnswer, saveStudentTrainingAnswer, uploadStudentTrainingFile } from "@/api/studentTrainingAnswer";
 import { parseTrainingArray } from "@/views/training/taskKeyMap";
 import { isStudentDemo } from "@/utils/studentDemo";
 
@@ -268,11 +258,18 @@ const checkingCorePain = ref(false);
 const corePainValidationMessage = ref("");
 const checkingValueCanvas = ref(false);
 const valueCanvasValidationMessage = ref("");
+const checkingPositioning = ref(false);
+const positioningValidationMessage = ref("");
 const uploadingValueCanvas = ref(false);
 const valueCanvasInput = ref(null);
 const taskConfig = ref(null);
 
 const corePainTypes = ["核心痛点1", "核心痛点2", "核心痛点3", "弱需求", "伪需求"];
+const positioningStatementFields = ["targetUser", "productName", "productCategory", "coreValue", "differentiationReason"];
+
+function createPositioningStatement(id) {
+  return { id, targetUser: "", productName: "", productCategory: "", coreValue: "", differentiationReason: "" };
+}
 
 const defaultRequirement =
   "产品价值主张及定位需要在市场调研和用户洞察基础上，明确目标用户、核心价值、差异化优势和定位表达。";
@@ -294,6 +291,7 @@ function createForm() {
     customerProfile: { jobs: "", pains: "", gains: "" },
     valueMap: { products: "", painRelievers: "", gainCreators: "" },
     valuePropositionCanvas: { url: "", name: "" },
+    positioningStatements: [createPositioningStatement(1), createPositioningStatement(2)],
     valueCanvas: { customerJobs: "", pains: "", gains: "", products: "", painRelievers: "", gainCreators: "" },
     statement: { targetUsers: "", valueProposition: "", differentiation: "", positioning: "" },
   };
@@ -350,6 +348,7 @@ async function setCurrentStep(step) {
   if (targetStep > form.value.activeStep) {
     if (form.value.activeStep === 1 && !(await ensureCorePainValid())) return;
     if (form.value.activeStep === 2 && !(await ensureValueCanvasValid())) return;
+    if (form.value.activeStep === 3 && !(await ensurePositioningValid())) return;
   }
   form.value.activeStep = targetStep;
 }
@@ -388,6 +387,7 @@ function normalizeForm(value = {}) {
     customerProfile: { ...base.customerProfile, ...(value.customerProfile || {}) },
     valueMap: { ...base.valueMap, ...(value.valueMap || {}) },
     valuePropositionCanvas: { ...base.valuePropositionCanvas, ...(value.valuePropositionCanvas || {}) },
+    positioningStatements: normalizePositioningStatements(value.positioningStatements),
     valueCanvas: { ...base.valueCanvas, ...(value.valueCanvas || {}) },
     statement: { ...base.statement, ...(value.statement || {}) },
   };
@@ -403,6 +403,14 @@ function normalizeCorePainRows(rows = []) {
   }));
 }
 
+function normalizePositioningStatements(statements = []) {
+  const savedStatements = Array.isArray(statements) ? statements : [];
+  return [1, 2].map((id, index) => {
+    const saved = savedStatements[index] || {};
+    return positioningStatementFields.reduce((result, field) => ({ ...result, [field]: String(saved[field] || "") }), { id });
+  });
+}
+
 async function ensureCorePainValid() {
   if (checkingCorePain.value) return false;
   checkingCorePain.value = true;
@@ -437,6 +445,20 @@ async function ensureValueCanvasValid() {
   } finally { checkingValueCanvas.value = false; }
 }
 
+async function ensurePositioningValid() {
+  if (checkingPositioning.value) return false;
+  checkingPositioning.value = true;
+  try {
+    const response = await checkProductValuePositioningStepThree({ statements: form.value.positioningStatements });
+    const result = response?.data || {};
+    positioningValidationMessage.value = result.message || (result.valid ? "两版定位陈述填写完整。" : "请完整填写两个产品价值定位陈述版本。");
+    return result.valid === true;
+  } catch (error) {
+    positioningValidationMessage.value = error?.message || "定位陈述校验失败，请稍后重试。";
+    return false;
+  } finally { checkingPositioning.value = false; }
+}
+
 function buildOutcome() {
   return {
     taskKey: TASK_KEY,
@@ -450,6 +472,7 @@ function buildOutcome() {
     customerProfile: form.value.customerProfile,
     valueMap: form.value.valueMap,
     valuePropositionCanvas: form.value.valuePropositionCanvas,
+    positioningStatements: form.value.positioningStatements,
     valueCanvas: form.value.valueCanvas,
     statement: form.value.statement,
     updatedAt: new Date().toISOString(),
@@ -469,6 +492,7 @@ async function persist(status = "IN_PROGRESS") {
   if (status !== "RESET") {
     if (form.value.activeStep === 1 && !(await ensureCorePainValid())) return false;
     if (form.value.activeStep === 2 && !(await ensureValueCanvasValid())) return false;
+    if (form.value.activeStep === 3 && !(await ensurePositioningValid())) return false;
   }
   saving.value = true;
   try {
@@ -504,6 +528,8 @@ function exportOutcome() {
   URL.revokeObjectURL(url);
 }
 
+function numberToChinese(number) { return ["一", "二", "三", "四"][number - 1] || String(number); }
+
 const customerProfileExportContent = computed(() => `# 用户档案（Customer Profile）\n\n## 用户目标（Jobs）\n${form.value.customerProfile.jobs}\n\n## 痛点（Pains）\n${form.value.customerProfile.pains}\n\n## 收益期望（Gains）\n${form.value.customerProfile.gains}\n`);
 const valueMapExportContent = computed(() => `# 产品价值地图（Value Map）\n\n## 产品与服务\n${form.value.valueMap.products}\n\n## 痛点缓释器（Pain Relievers）\n${form.value.valueMap.painRelievers}\n\n## 增益创造器（Gain Creators）\n${form.value.valueMap.gainCreators}\n`);
 
@@ -1112,6 +1138,67 @@ async function handleValueCanvasUpload(event) {
   .template-download-button { position: absolute; top: 44px; left: 18px; }
 }
 
+.positioning-intro {
+  margin-bottom: 18px;
+  padding: 15px 18px;
+  border-left: 3px solid #55ddff;
+  border-radius: 0 14px 14px 0;
+  background: linear-gradient(90deg, rgba(7, 92, 132, .28), rgba(5, 34, 51, .12));
+
+  p { margin: 0; color: #c9e7f3; font-size: 14px; line-height: 1.8; }
+  p + p { margin-top: 5px; color: #a9ccda; }
+}
+
+.positioning-version-card {
+  overflow: hidden;
+  margin-top: 16px;
+  border: 1px solid rgba(74, 178, 223, .36);
+  border-radius: 16px;
+  background: linear-gradient(120deg, rgba(5, 55, 81, .42), rgba(1, 17, 29, .5));
+
+  header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 14px;
+    padding: 10px 16px;
+    border-bottom: 1px solid rgba(75, 174, 218, .24);
+    background: rgba(4, 86, 125, .35);
+  }
+
+  header span { color: #f2fdff; font-size: 16px; font-weight: 900; }
+  header small { color: #8ecadd; font-size: 12px; }
+}
+
+.statement-preview {
+  margin: 0;
+  padding: 15px 16px;
+  color: #afd2df;
+  background: rgba(0, 16, 29, .36);
+  font-size: 14px;
+  line-height: 1.85;
+
+  strong { color: #64daf8; font-weight: 800; }
+}
+
+.positioning-fields {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 12px;
+  padding: 16px;
+
+  label { display: grid; gap: 6px; min-width: 0; }
+  label span { color: #d8f2fb; font-size: 12px; font-weight: 800; }
+  input,
+  textarea {
+    width: 100%; padding: 10px 11px; border: 1px solid rgba(45, 95, 126, .95); border-radius: 9px; color: #eef5ff; background: rgba(4, 24, 38, .72); box-sizing: border-box; font: inherit; font-size: 13px; line-height: 1.55;
+    &:focus { border-color: rgba(92, 224, 255, .7); box-shadow: 0 0 0 3px rgba(0, 174, 255, .13); outline: none; }
+  }
+  textarea { min-height: 66px; resize: vertical; }
+}
+
+.positioning-fields__wide { grid-column: 1 / -1; }
+
 .step-navigation {
   display: flex;
   justify-content: center;
@@ -1192,6 +1279,8 @@ async function handleValueCanvasUpload(event) {
     writing-mode: vertical-rl;
   }
   .value-grid { grid-template-columns: 1fr; }
+  .positioning-fields { grid-template-columns: 1fr; }
+  .positioning-fields__wide { grid-column: auto; }
   .canvas-guidance { padding: 15px; }
   .canvas-guidance .template-download-button { position: static; margin: 8px 0; }
 }