diff --git a/src/api/studentTrainingAnswer.js b/src/api/studentTrainingAnswer.js
index 311f1ed..d0fce08 100644
--- a/src/api/studentTrainingAnswer.js
+++ b/src/api/studentTrainingAnswer.js
@@ -134,3 +134,39 @@ export function checkNewProductSurveyStepTwo(form) {
     headers: { repeatSubmit: false },
   });
 }
+
+function validateNewProductSurveyStepThreeDemo(payload) {
+  const expectedDimensions = ["核心层", "有形层", "延伸层"];
+  const rows = Array.isArray(payload?.rows) ? payload.rows : [];
+  if (rows.length !== expectedDimensions.length) {
+    throw new Error("请完成核心层、有形层、延伸层分析");
+  }
+  const dimensions = rows.map((row) => String(row?.dimension || "").trim());
+  if (new Set(dimensions).size !== expectedDimensions.length || expectedDimensions.some((dimension) => !dimensions.includes(dimension))) {
+    throw new Error("分析维度不完整或重复");
+  }
+  const invalidRow = rows.find((row) => {
+    const points = Array.isArray(row?.points) ? row.points : [];
+    return points.map((point) => String(point || "").trim()).filter(Boolean).length < 2;
+  });
+  if (invalidRow) {
+    throw new Error(`${invalidRow.dimension || "该层"}至少填写 2 条分析要点`);
+  }
+  return { valid: true, message: "校验通过" };
+}
+
+export function checkNewProductSurveyStepThree(payload) {
+  if (isStudentDemo()) {
+    try {
+      return Promise.resolve({ code: 200, data: validateNewProductSurveyStepThreeDemo(payload) });
+    } catch (error) {
+      return Promise.reject(error);
+    }
+  }
+  return request({
+    url: "/api/student-training-answers/new-product-survey/step-3/validate",
+    method: "post",
+    data: payload,
+    headers: { repeatSubmit: false },
+  });
+}
diff --git a/src/views/foundation/new-product-survey.vue b/src/views/foundation/new-product-survey.vue
index aa52aa4..774d2b0 100644
--- a/src/views/foundation/new-product-survey.vue
+++ b/src/views/foundation/new-product-survey.vue
@@ -154,10 +154,10 @@
                 <p class="section-eyebrow">Step 03</p>
                 <h3>{{ getStepName(3) }}</h3>
               </div>
-              <span class="step-chip">产品1 / 产品2 / 产品3</span>
+              <span class="step-chip">三层次对照分析</span>
             </div>
             <p class="step-desc">
-              根据查找的产品，从核心层、有形层、延伸层开展三层次分析，对比不同产品如何创造用户价值。
+              基于上一步采集的真实数据，运用“三层次理论”进行深度分析，参考示例填写下表；每层至少填写 2 条要点并按换行分条。
             </p>
 
             <div class="training-table-wrap">
@@ -165,21 +165,22 @@
                 <thead>
                   <tr>
                     <th>分析维度</th>
-                    <th>内容要求</th>
                     <th>实例：AI学习机</th>
-                    <th>产品1</th>
-                    <th>产品2</th>
-                    <th>产品3</th>
+                    <th>{{ step2Form.productName || '所选产品' }}分析</th>
                   </tr>
                 </thead>
                 <tbody>
                   <tr v-for="row in step3Rows" :key="row.dimension">
-                    <td class="dimension-cell">{{ row.dimension }}</td>
-                    <td class="requirement-cell">{{ row.requirement }}</td>
-                    <td class="example-cell">{{ row.example }}</td>
-                    <td><textarea v-model="row.product1" class="cell-textarea" /></td>
-                    <td><textarea v-model="row.product2" class="cell-textarea" /></td>
-                    <td><textarea v-model="row.product3" class="cell-textarea" /></td>
+                    <td class="dimension-cell"><strong>{{ row.dimension }}</strong><span>{{ row.definition }}</span></td>
+                    <td class="example-cell">
+                      <ol class="reference-points">
+                        <li v-for="point in row.referencePoints" :key="point">{{ point }}</li>
+                      </ol>
+                    </td>
+                    <td class="analysis-input-cell">
+                      <textarea v-model="row.analysis" class="cell-textarea" rows="7" placeholder="每行填写一条分析要点" />
+                      <p class="analysis-count" :class="{ 'is-ready': countStepThreePoints(row.analysis) >= 2 }">已填写 {{ countStepThreePoints(row.analysis) }} / 至少 2 条</p>
+                    </td>
                   </tr>
                 </tbody>
               </table>
@@ -269,7 +270,7 @@ import {
   TrendCharts,
 } from "@element-plus/icons-vue";
 import { getTrainingTaskByKey } from "@/api/trainingTask";
-import { checkNewProductSurveyStepOne, checkNewProductSurveyStepTwo, getStudentTrainingAnswer, saveStudentTrainingAnswer, uploadStudentTrainingFile } from "@/api/studentTrainingAnswer";
+import { checkNewProductSurveyStepOne, checkNewProductSurveyStepThree, checkNewProductSurveyStepTwo, getStudentTrainingAnswer, saveStudentTrainingAnswer, uploadStudentTrainingFile } from "@/api/studentTrainingAnswer";
 import useUserStore from "@/store/modules/user";
 import { extractTrainingStepNames } from "@/views/training/taskKeyMap";
 import TrainingAiSidebar from "@/views/components/TrainingAiSidebar.vue";
@@ -357,33 +358,14 @@ const STEP_ONE_SELLING_POINTS = [
 
 const createStep2Form = () => ({ platform: "", scene: "", customScene: "", keyword: "", productName: "", images: [] });
 
-const createStep3Rows = () => [
-  {
-    dimension: "核心层",
-    requirement: "说明产品解决的核心痛点、用户需求和核心利益。",
-    example: "解决学生学习效率低、家长辅导时间不足等痛点，提供个性化学习支持。",
-    product1: "",
-    product2: "",
-    product3: "",
-  },
-  {
-    dimension: "有形层",
-    requirement: "记录功能、设计、品牌、参数、包装、价格等可见要素。",
-    example: "护眼屏、AI语音互动、拍照搜题、错题本、课程资源、学习报告。",
-    product1: "",
-    product2: "",
-    product3: "",
-  },
-  {
-    dimension: "延伸层",
-    requirement: "分析售后、会员、内容更新、物流、生态兼容和数据安全等附加服务。",
-    example: "课程持续更新、家长端管理、云端错题同步、售后保修、会员内容权益。",
-    product1: "",
-    product2: "",
-    product3: "",
-  },
+const STEP_THREE_REFERENCE_ROWS = [
+  { dimension: "核心层", definition: "AI技术解决的核心需求/功能", referencePoints: ["大模型作业批改", "自适应学习路径规划"] },
+  { dimension: "有形层", definition: "外观/材质/参数/价格策略", referencePoints: ["护眼屏+铝合金机身", "搭载NPU芯片", "全平台统一定价2999元，某网红直播间专属价2699元"] },
+  { dimension: "延伸层", definition: "软件升级/专属服务/社群运营", referencePoints: ["终身免费题库更新", "VIP学科规划师1对1", "家长互助社群及资料共享微信群"] },
 ];
 
+const createStep3Rows = () => STEP_THREE_REFERENCE_ROWS.map((row) => ({ ...row, analysis: "" }));
+
 const createStep4Form = () => ({
   coreValue: "",
   tangibleValue: "",
@@ -406,7 +388,7 @@ const currentStudyTip = computed(() => {
   const tips = {
     1: "当前步骤建议：先从案例或电商详情页中拆出核心层、有形层、延伸层，不要把功能和用户利益混在一起。",
     2: "当前步骤建议：选择一个主流电商平台与真实 AI 产品，用“核心词 + 属性词 + 场景词”搜索并保留主图、详情页截图。",
-    3: "当前步骤建议：同一维度横向比较 3 个产品，重点找出 AI 技术在哪一层创造了差异化。",
+    3: "当前步骤建议：将上一步选定产品的卖点按核心层、有形层、延伸层拆分，每层至少记录两条可核对的分析要点。",
     4: "当前步骤建议：把前面三步的发现收束为产品开发启发，说明哪些价值值得继续强化。",
   };
   return tips[currentStep.value];
@@ -623,7 +605,19 @@ function applyStep3Answer(value) {
   const parsed = safeParse(value);
   const rows = Array.isArray(parsed) ? parsed : parsed?.step3Rows || parsed?.rows || parsed?.layerRows;
   if (!Array.isArray(rows) || !rows.length) return false;
-  step3Rows.value = normalizeRows(rows, createStep3Rows(), "dimension");
+  const savedByDimension = rows.reduce((result, row) => {
+    if (row?.dimension) result[row.dimension] = row;
+    return result;
+  }, {});
+  step3Rows.value = createStep3Rows().map((row, index) => {
+    const saved = savedByDimension[row.dimension] || rows[index] || {};
+    const points = Array.isArray(saved.points) ? saved.points : [];
+    const legacyValue = [saved.analysis, saved.product1, saved.product2, saved.product3].find((item) => String(item || "").trim());
+    return {
+      ...row,
+      analysis: points.length ? points.map((item) => String(item || "").trim()).filter(Boolean).join("\n") : String(legacyValue || ""),
+    };
+  });
   return true;
 }
 
@@ -667,6 +661,26 @@ function normalizeRows(rows, fallback, matchKey = "") {
   }));
 }
 
+function splitStepThreePoints(value) {
+  return String(value || "")
+    .split(/\r?\n/)
+    .map((item) => item.trim())
+    .filter(Boolean);
+}
+
+function countStepThreePoints(value) {
+  return splitStepThreePoints(value).length;
+}
+
+function buildStepThreeValidationPayload() {
+  return {
+    rows: step3Rows.value.map((row) => ({
+      dimension: row.dimension,
+      points: splitStepThreePoints(row.analysis),
+    })),
+  };
+}
+
 function buildAnswerPayload(status) {
   const saveAction = status === "SUBMITTED" ? "SUBMIT" : status === "RESET" ? "RESET" : "SAVE";
   return {
@@ -674,7 +688,7 @@ function buildAnswerPayload(status) {
     currentStep: currentStep.value,
     step1Answer: JSON.stringify({ classifications: classifications.value, checkResult: checkResult.value }),
     step2Answer: JSON.stringify(step2Form.value),
-    step3Answer: JSON.stringify(step3Rows.value),
+    step3Answer: JSON.stringify(buildStepThreeValidationPayload()),
     step4Answer: JSON.stringify(step4Form.value),
   };
 }
@@ -714,6 +728,20 @@ async function nextStep() {
     }
     return;
   }
+  if (currentStep.value === 3) {
+    checking.value = true;
+    try {
+      await checkNewProductSurveyStepThree(buildStepThreeValidationPayload());
+      await saveAnswer("IN_PROGRESS", true);
+      proxy?.$modal?.msgSuccess("第三步分析已校验并保存");
+      advanceStep();
+    } catch (error) {
+      proxy?.$modal?.msgWarning(error?.message || "请确保每个层次至少填写 2 条分析要点");
+    } finally {
+      checking.value = false;
+    }
+    return;
+  }
   if (currentStep.value !== 1) {
     advanceStep();
     return;
@@ -1513,9 +1541,26 @@ function exportOutcome() {
 }
 
 .dimension-cell {
+  min-width: 170px;
   color: #eafaff;
-  font-weight: 900;
-  text-align: center;
+  text-align: left;
+
+  strong,
+  span {
+    display: block;
+  }
+
+  strong {
+    margin-bottom: 7px;
+    font-weight: 900;
+  }
+
+  span {
+    color: #9fc6da;
+    font-size: 12px;
+    font-weight: 700;
+    line-height: 1.55;
+  }
 }
 
 .requirement-cell,
@@ -1529,6 +1574,28 @@ function exportOutcome() {
   color: #f5d99d;
 }
 
+.reference-points {
+  display: grid;
+  gap: 8px;
+  margin: 0;
+  padding-left: 20px;
+}
+
+.analysis-input-cell {
+  min-width: 280px;
+}
+
+.analysis-count {
+  margin: 8px 2px 0;
+  color: #ffb1b1;
+  font-size: 12px;
+  font-weight: 700;
+
+  &.is-ready {
+    color: #86e7bd;
+  }
+}
+
 .example-hint {
   display: flex;
   gap: 8px;
diff --git a/tests/new-product-survey-step-one.static.test.cjs b/tests/new-product-survey-step-one.static.test.cjs
index e593bc5..b2440cf 100644
--- a/tests/new-product-survey-step-one.static.test.cjs
+++ b/tests/new-product-survey-step-one.static.test.cjs
@@ -24,6 +24,11 @@ assert.match(page, /@click="previewStepTwoImage\(image\.url\)"/, "uploaded produ
 assert.match(page, /step2Answer: JSON\.stringify\(step2Form\.value\)/, "step two must persist the survey form instead of table rows");
 assert.match(page, /checkNewProductSurveyStepTwo\(step2Form\.value\)/, "step two must request server-side validation before advancing");
 assert.match(api, /new-product-survey\/step-2\/validate/, "the student API must call the step-two validation endpoint");
+assert.match(page, /const STEP_THREE_REFERENCE_ROWS = \[/, "step three must define the fixed AI learning-machine reference rows");
+assert.match(page, /step2Form\.productName \|\| '所选产品'/, "step three must use the surveyed product name as its analysis-column heading");
+assert.match(page, /countStepThreePoints\(row\.analysis\)/, "step three must show the number of entered analysis points");
+assert.match(page, /checkNewProductSurveyStepThree\(buildStepThreeValidationPayload\(\)\)/, "step three must validate its rows before advancing");
+assert.match(api, /new-product-survey\/step-3\/validate/, "the student API must call the step-three validation endpoint");
 assert.match(materialButton, /下载案例资料/, "the download button must use a fixed student-facing label");
 assert.doesNotMatch(materialButton, /\{\{ material\?\.name \|\| "案例文档" \}\}/, "the upload file name must not become button text");