diff --git a/src/api/studentTrainingAnswer.js b/src/api/studentTrainingAnswer.js
index b3cf55b..a8a0c3c 100644
--- a/src/api/studentTrainingAnswer.js
+++ b/src/api/studentTrainingAnswer.js
@@ -492,3 +492,22 @@ export function checkProductValuePositioningStepThree(payload) {
     headers: { repeatSubmit: false },
   });
 }
+
+export function checkProductValuePositioningStepFour(payload) {
+  const sectionKeys = ["marketInsights", "marketOverview", "userAnalysis", "competitorAnalysis", "productRequirements"];
+  if (isStudentDemo()) {
+    const valid = sectionKeys.every((key) => Array.isArray(payload?.[key]) && payload[key].length > 0
+      && payload[key].every((row) => Boolean(String(row?.content || "").trim())))
+      && Boolean(String(payload?.productPositioning || "").trim());
+    return Promise.resolve({
+      code: 200,
+      data: { valid, message: valid ? "MRD 文档填写完整。" : "请完整填写 MRD 的五组分析内容和产品定位。" },
+    });
+  }
+  return request({
+    url: "/api/student-training-answers/product-value-positioning/step-4/validate",
+    method: "post",
+    data: payload,
+    headers: { repeatSubmit: false },
+  });
+}
diff --git a/src/views/product/differentiation.vue b/src/views/product/differentiation.vue
index c0afae2..910ef3b 100644
--- a/src/views/product/differentiation.vue
+++ b/src/views/product/differentiation.vue
@@ -174,24 +174,35 @@
               <h3>{{ activeStepName }}</h3>
             </div>
           </div>
-          <div class="step-content">
-            <label class="field-block">
-              <span>目标用户：</span>
-              <textarea v-model="form.statement.targetUsers" />
-            </label>
-            <label class="field-block">
-              <span>核心价值主张：</span>
-              <textarea v-model="form.statement.valueProposition" />
-            </label>
-            <label class="field-block">
-              <span>差异化优势：</span>
-              <textarea v-model="form.statement.differentiation" />
-            </label>
-            <label class="field-block">
-              <span>产品定位陈述：</span>
-              <textarea v-model="form.statement.positioning" />
-            </label>
+          <div class="mrd-intro">
+            基于前述步骤的分析成果，撰写一份完整的产品市场需求说明书（MRD）。MRD 文档全面分析产品的市场机会、用户需求及竞争格局，明确产品核心定位与功能方向，为后续产品开发、资源投入及战略决策提供数据支撑与逻辑依据。
           </div>
+          <section v-for="section in mrdSections" :key="section.key" class="mrd-section">
+            <h4>{{ section.order }}. {{ section.title }}</h4>
+            <div class="mrd-table-wrap">
+              <table class="mrd-table">
+                <thead><tr><th>序号</th><th v-if="section.hasModule">模块</th><th>标题</th><th>内容</th></tr></thead>
+                <tbody>
+                  <tr v-for="(row, index) in form.mrd[section.key]" :key="row.id">
+                    <td>{{ index + 1 }}</td>
+                    <td v-if="section.hasModule" class="mrd-module">{{ row.module }}</td>
+                    <td class="mrd-row-title">{{ row.title }}</td>
+                    <td><textarea v-model="row.content" :aria-label="`${section.title}${row.title}内容`" :placeholder="`填写${row.title}内容`" /></td>
+                  </tr>
+                </tbody>
+              </table>
+            </div>
+          </section>
+          <section class="mrd-positioning-section">
+            <h4>6. 产品定位</h4>
+            <textarea v-model="form.mrd.productPositioning" aria-label="产品定位" placeholder="综合市场、用户、竞品和需求分析，填写产品定位" />
+          </section>
+          <div class="mrd-guidance">
+            <p>根据以上结构框架及信息，结合实训 8-11，撰写 MRD 文档。</p>
+            <p>1. 根据报告模板，自行分析撰写 MRD 文档。</p>
+            <p>2. 使用通用 AI 大模型辅助完成报告，参考步骤提示词见案例资料文档。</p>
+          </div>
+          <p v-if="mrdValidationMessage" class="core-pain-validation-message" role="status">{{ mrdValidationMessage }}</p>
         </section>
 
         <section v-show="hasConfiguredSteps && form.activeStep > 4" class="step-card completion-card">
@@ -247,7 +258,7 @@ 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, checkProductValuePositioningStepThree, getStudentTrainingAnswer, saveStudentTrainingAnswer, uploadStudentTrainingFile } from "@/api/studentTrainingAnswer";
+import { checkProductValuePositioningStepOne, checkProductValuePositioningStepTwo, checkProductValuePositioningStepThree, checkProductValuePositioningStepFour, getStudentTrainingAnswer, saveStudentTrainingAnswer, uploadStudentTrainingFile } from "@/api/studentTrainingAnswer";
 import { parseTrainingArray } from "@/views/training/taskKeyMap";
 import { isStudentDemo } from "@/utils/studentDemo";
 
@@ -260,17 +271,34 @@ const checkingValueCanvas = ref(false);
 const valueCanvasValidationMessage = ref("");
 const checkingPositioning = ref(false);
 const positioningValidationMessage = ref("");
+const checkingMrd = ref(false);
+const mrdValidationMessage = 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"];
+const mrdSections = [
+  { key: "marketInsights", order: 1, title: "市场问题与机会", rows: [{ title: "市场痛点" }, { title: "市场机会" }, { title: "发展趋势" }] },
+  { key: "marketOverview", order: 2, title: "市场概述", rows: [{ title: "目标市场" }, { title: "市场特征" }] },
+  { key: "userAnalysis", order: 3, title: "用户与购买者分析", rows: [{ title: "目标用户画像" }, { title: "用户场景与需求" }, { title: "购买者与决策者" }] },
+  { key: "competitorAnalysis", order: 4, title: "竞品分析", rows: [{ title: "竞品对比分析" }, { title: "差异化机会" }] },
+  { key: "productRequirements", order: 5, title: "产品需求说明", hasModule: true, rows: [{ module: "功能需求", title: "核心功能" }, { module: "功能需求", title: "辅助功能" }, { module: "非功能需求", title: "性能需求" }, { module: "非功能需求", title: "安全需求" }, { module: "非功能需求", title: "兼容性" }] },
+];
 
 function createPositioningStatement(id) {
   return { id, targetUser: "", productName: "", productCategory: "", coreValue: "", differentiationReason: "" };
 }
 
+function createMrd() {
+  const mrd = { productPositioning: "" };
+  mrdSections.forEach((section) => {
+    mrd[section.key] = section.rows.map((row, index) => ({ id: index + 1, module: row.module || "", title: row.title, content: "" }));
+  });
+  return mrd;
+}
+
 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。";
 const defaultBackground =
@@ -292,6 +320,7 @@ function createForm() {
     valueMap: { products: "", painRelievers: "", gainCreators: "" },
     valuePropositionCanvas: { url: "", name: "" },
     positioningStatements: [createPositioningStatement(1), createPositioningStatement(2)],
+    mrd: createMrd(),
     valueCanvas: { customerJobs: "", pains: "", gains: "", products: "", painRelievers: "", gainCreators: "" },
     statement: { targetUsers: "", valueProposition: "", differentiation: "", positioning: "" },
   };
@@ -349,6 +378,7 @@ async function setCurrentStep(step) {
     if (form.value.activeStep === 1 && !(await ensureCorePainValid())) return;
     if (form.value.activeStep === 2 && !(await ensureValueCanvasValid())) return;
     if (form.value.activeStep === 3 && !(await ensurePositioningValid())) return;
+    if (form.value.activeStep === 4 && !(await ensureMrdValid())) return;
   }
   form.value.activeStep = targetStep;
 }
@@ -388,6 +418,7 @@ function normalizeForm(value = {}) {
     valueMap: { ...base.valueMap, ...(value.valueMap || {}) },
     valuePropositionCanvas: { ...base.valuePropositionCanvas, ...(value.valuePropositionCanvas || {}) },
     positioningStatements: normalizePositioningStatements(value.positioningStatements),
+    mrd: normalizeMrd(value.mrd),
     valueCanvas: { ...base.valueCanvas, ...(value.valueCanvas || {}) },
     statement: { ...base.statement, ...(value.statement || {}) },
   };
@@ -411,6 +442,21 @@ function normalizePositioningStatements(statements = []) {
   });
 }
 
+function normalizeMrd(mrd = {}) {
+  const base = createMrd();
+  mrdSections.forEach((section) => {
+    const savedRows = Array.isArray(mrd?.[section.key]) ? mrd[section.key] : [];
+    base[section.key] = section.rows.map((row, index) => ({
+      id: index + 1,
+      module: row.module || "",
+      title: row.title,
+      content: String(savedRows[index]?.content || ""),
+    }));
+  });
+  base.productPositioning = String(mrd?.productPositioning || "");
+  return base;
+}
+
 async function ensureCorePainValid() {
   if (checkingCorePain.value) return false;
   checkingCorePain.value = true;
@@ -459,6 +505,20 @@ async function ensurePositioningValid() {
   } finally { checkingPositioning.value = false; }
 }
 
+async function ensureMrdValid() {
+  if (checkingMrd.value) return false;
+  checkingMrd.value = true;
+  try {
+    const response = await checkProductValuePositioningStepFour(form.value.mrd);
+    const result = response?.data || {};
+    mrdValidationMessage.value = result.message || (result.valid ? "MRD 文档填写完整。" : "请完整填写 MRD 的五组分析内容和产品定位。");
+    return result.valid === true;
+  } catch (error) {
+    mrdValidationMessage.value = error?.message || "MRD 校验失败，请稍后重试。";
+    return false;
+  } finally { checkingMrd.value = false; }
+}
+
 function buildOutcome() {
   return {
     taskKey: TASK_KEY,
@@ -473,6 +533,7 @@ function buildOutcome() {
     valueMap: form.value.valueMap,
     valuePropositionCanvas: form.value.valuePropositionCanvas,
     positioningStatements: form.value.positioningStatements,
+    mrd: form.value.mrd,
     valueCanvas: form.value.valueCanvas,
     statement: form.value.statement,
     updatedAt: new Date().toISOString(),
@@ -493,6 +554,7 @@ async function persist(status = "IN_PROGRESS") {
     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;
+    if (form.value.activeStep === 4 && !(await ensureMrdValid())) return false;
   }
   saving.value = true;
   try {
@@ -1199,6 +1261,64 @@ async function handleValueCanvasUpload(event) {
 
 .positioning-fields__wide { grid-column: 1 / -1; }
 
+.mrd-intro {
+  margin-bottom: 20px;
+  padding: 15px 18px;
+  border: 1px solid rgba(78, 183, 227, .3);
+  border-radius: 14px;
+  color: #c9e6f1;
+  background: linear-gradient(100deg, rgba(5, 78, 112, .28), rgba(3, 26, 42, .18));
+  font-size: 14px;
+  line-height: 1.85;
+}
+
+.mrd-section { margin-top: 24px; }
+.mrd-section h4,
+.mrd-positioning-section h4 { margin: 0 0 10px; color: #ffffff; font-size: 16px; font-weight: 900; }
+.mrd-table-wrap { overflow-x: auto; }
+
+.mrd-table {
+  width: 100%;
+  min-width: 760px;
+  border-collapse: collapse;
+  table-layout: fixed;
+
+  th, td { border: 1px solid rgba(77, 167, 220, .3); }
+  th { padding: 9px; color: #f5fcff; background: linear-gradient(100deg, #0787bd, #075276); font-size: 13px; font-weight: 800; }
+  td { min-height: 42px; padding: 7px; color: #d5edf7; background: rgba(1, 14, 26, .48); font-size: 13px; text-align: center; vertical-align: middle; }
+  th:nth-child(1), td:nth-child(1) { width: 8%; }
+  th:nth-child(2), td:nth-child(2) { width: 17%; }
+  .mrd-row-title { color: #bbebf6; font-weight: 800; }
+  .mrd-module { color: #a6d7e6; }
+  textarea {
+    display: block; width: 100%; min-height: 50px; padding: 8px 10px; border: 1px solid rgba(45, 95, 126, .95); border-radius: 8px; color: #eef5ff; background: rgba(4, 24, 38, .72); box-sizing: border-box; font: inherit; font-size: 13px; line-height: 1.55; resize: vertical;
+    &:focus { border-color: rgba(92, 224, 255, .7); box-shadow: 0 0 0 3px rgba(0, 174, 255, .13); outline: none; }
+  }
+}
+
+.mrd-positioning-section {
+  margin-top: 25px;
+  padding: 16px;
+  border: 1px solid rgba(74, 178, 223, .34);
+  border-radius: 14px;
+  background: rgba(1, 31, 48, .35);
+
+  textarea {
+    display: block; width: 100%; min-height: 120px; padding: 12px; border: 1px solid rgba(45, 95, 126, .95); border-radius: 10px; color: #eef5ff; background: rgba(4, 24, 38, .72); box-sizing: border-box; font: inherit; font-size: 14px; line-height: 1.65; resize: vertical;
+    &:focus { border-color: rgba(92, 224, 255, .7); box-shadow: 0 0 0 3px rgba(0, 174, 255, .13); outline: none; }
+  }
+}
+
+.mrd-guidance {
+  margin-top: 20px;
+  padding: 13px 16px;
+  border-left: 3px solid #4fdbf5;
+  border-radius: 0 12px 12px 0;
+  background: rgba(3, 46, 67, .26);
+  p { margin: 0; color: #bfdeea; font-size: 13px; line-height: 1.75; }
+  p + p { margin-top: 4px; }
+}
+
 .step-navigation {
   display: flex;
   justify-content: center;