diff --git a/app/catalog-image-map.ts b/app/catalog-image-map.ts
index 71e0554..94dcc66 100644
--- a/app/catalog-image-map.ts
+++ b/app/catalog-image-map.ts
@@ -24,6 +24,34 @@ const SOURCE_MAIN_IMAGES = {
   "313": "/catalog-products/source-main/313-main.png",
 } as const;
 
+const SOURCE_SIZE_IMAGES = {
+  "1004": "/catalog-products/size-reference/1004-size.png",
+  "258": "/catalog-products/size-reference/258-size.jpg",
+  "259": "/catalog-products/size-reference/259-size.jpg",
+  "266": "/catalog-products/size-reference/266-size.jpg",
+  "267": "/catalog-products/size-reference/267-size.jpg",
+  "268": "/catalog-products/size-reference/268-size.jpg",
+  "270": "/catalog-products/size-reference/270-size.jpg",
+  "271": "/catalog-products/size-reference/271-size.jpg",
+  "272": "/catalog-products/size-reference/272-size.jpg",
+  "273": "/catalog-products/size-reference/273-size.jpg",
+  "274": "/catalog-products/size-reference/274-size.jpg",
+  "275": "/catalog-products/size-reference/275-size.jpg",
+  "276": "/catalog-products/size-reference/276-size.jpg",
+  "308": "/catalog-products/size-reference/308-size.png",
+  "309": "/catalog-products/size-reference/309-size.png",
+  "310": "/catalog-products/size-reference/310-size.png",
+  "311": "/catalog-products/size-reference/311-size.png",
+  "313": "/catalog-products/size-reference/313-size.png",
+  "563": "/catalog-products/size-reference/563-size.png",
+  "565": "/catalog-products/size-reference/565-size.png",
+  "566": "/catalog-products/size-reference/566-size.png",
+  "567": "/catalog-products/size-reference/567-size.png",
+  "568": "/catalog-products/size-reference/568-size.png",
+  "572": "/catalog-products/size-reference/572-size.png",
+} as const;
+
+type ProductImageSet = Record<string, string>;
 type SourceImageKey = keyof typeof SOURCE_MAIN_IMAGES;
 
 function hasWeight(name: string, grams: string) {
@@ -37,57 +65,73 @@ function getGearSeries(name: string) {
   return null;
 }
 
-function getSmallServoImage(name: string): string | null {
-  if (hasWeight(name, "1\\.7")) return SOURCE_MAIN_IMAGES["1004"];
+function getSmallServoImage(name: string, images: ProductImageSet): string | null {
+  if (hasWeight(name, "1\\.7")) return images["1004"];
 
   const gearSeries = getGearSeries(name);
-  if (hasWeight(name, "2") && gearSeries === "plastic") return SOURCE_MAIN_IMAGES["272"];
-  if (hasWeight(name, "3\\.7") && gearSeries === "plastic") return SOURCE_MAIN_IMAGES["271"];
+  if (hasWeight(name, "2") && gearSeries === "plastic") return images["272"];
+  if (hasWeight(name, "3\\.7") && gearSeries === "plastic") return images["271"];
 
   if (hasWeight(name, "9")) {
-    if (gearSeries === "metal") return SOURCE_MAIN_IMAGES["266"];
-    if (gearSeries === "semi") return SOURCE_MAIN_IMAGES["259"];
-    if (gearSeries === "plastic") return SOURCE_MAIN_IMAGES["258"];
+    if (gearSeries === "metal") return images["266"];
+    if (gearSeries === "semi") return images["259"];
+    if (gearSeries === "plastic") return images["258"];
   }
 
   if (hasWeight(name, "17")) {
-    if (gearSeries === "metal") return SOURCE_MAIN_IMAGES["274"];
-    if (gearSeries === "plastic") return SOURCE_MAIN_IMAGES["273"];
+    if (gearSeries === "metal") return images["274"];
+    if (gearSeries === "plastic") return images["273"];
   }
 
   if (hasWeight(name, "25")) {
-    if (gearSeries === "metal") return SOURCE_MAIN_IMAGES["276"];
-    if (gearSeries === "plastic") return SOURCE_MAIN_IMAGES["275"];
+    if (gearSeries === "metal") return images["276"];
+    if (gearSeries === "plastic") return images["275"];
   }
 
   if (hasWeight(name, "37")) {
-    if (gearSeries === "metal") return SOURCE_MAIN_IMAGES["270"];
-    if (gearSeries === "semi") return SOURCE_MAIN_IMAGES["268"];
-    if (gearSeries === "plastic") return SOURCE_MAIN_IMAGES["267"];
+    if (gearSeries === "metal") return images["270"];
+    if (gearSeries === "semi") return images["268"];
+    if (gearSeries === "plastic") return images["267"];
   }
 
   return null;
 }
 
-function getBrickServoImage(name: string): string | null {
-  if (name.includes("3x3x3")) return SOURCE_MAIN_IMAGES["311"];
-  if (name.includes("3x3x7")) return SOURCE_MAIN_IMAGES["310"];
-  if (name.includes("3x7x5")) return SOURCE_MAIN_IMAGES["309"];
-  if (name.includes("6x6x5")) return SOURCE_MAIN_IMAGES["308"];
-  if (name.includes("11x5x4")) return SOURCE_MAIN_IMAGES["313"];
+function getBrickServoImage(name: string, images: ProductImageSet): string | null {
+  if (name.includes("3x3x3")) return images["311"];
+  if (name.includes("3x3x7")) return images["310"];
+  if (name.includes("3x7x5")) return images["309"];
+  if (name.includes("6x6x5")) return images["308"];
+  if (name.includes("11x5x4")) return images["313"];
   return null;
 }
 
 export function getCatalogProductImage(product: CatalogProduct) {
   if (product.category === "积木舵机") {
-    return getBrickServoImage(product.name) ?? product.image;
+    return getBrickServoImage(product.name, SOURCE_MAIN_IMAGES) ?? product.image;
   }
 
   if (product.category === "标准舵机" || product.category === "异形舵机") {
-    return getSmallServoImage(product.name) ?? product.image;
+    return getSmallServoImage(product.name, SOURCE_MAIN_IMAGES) ?? product.image;
   }
 
   return product.image;
 }
 
+export function getCatalogProductDimensionImage(product: CatalogProduct) {
+  if (product.category === "舵盘配件") {
+    return SOURCE_SIZE_IMAGES[product.id.replace("shop-", "")] ?? null;
+  }
+
+  if (product.category === "积木舵机") {
+    return getBrickServoImage(product.name, SOURCE_SIZE_IMAGES);
+  }
+
+  if (product.category === "标准舵机" || product.category === "异形舵机") {
+    return getSmallServoImage(product.name, SOURCE_SIZE_IMAGES);
+  }
+
+  return null;
+}
+
 export const CATALOG_SOURCE_IMAGE_KEYS: SourceImageKey[] = Object.keys(SOURCE_MAIN_IMAGES) as SourceImageKey[];
diff --git a/app/globals.css b/app/globals.css
index 2ed300e..0f2ff57 100644
--- a/app/globals.css
+++ b/app/globals.css
@@ -458,12 +458,23 @@ select:focus, input:focus, textarea:focus { border-color: var(--blue); box-shado
   cursor: pointer;
   font-size: 20px;
 }
-.catalog-modal-product { display: grid; grid-template-columns: 360px 1fr; align-items: center; gap: 34px; }
-.catalog-modal-image { min-height: 240px; display: flex; align-items: center; justify-content: center; border-radius: 13px; overflow: hidden; background: #f2f5fa; }
-.catalog-modal-image img { display: block; max-width: 100%; max-height: min(55vh, 460px); width: auto; height: auto; object-fit: contain; mix-blend-mode: multiply; }
+.catalog-modal-product { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(245px, .75fr); align-items: stretch; gap: 25px; }
+.catalog-modal-visuals { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
+.catalog-modal-visual-card { min-width: 0; display: grid; grid-template-rows: auto minmax(0, 1fr); gap: 7px; }
+.catalog-modal-visual-label { color: #687791; font-size: 10px; font-weight: 800; letter-spacing: .04em; }
+.catalog-modal-image, .catalog-modal-size-image { min-height: 250px; display: flex; align-items: center; justify-content: center; border: 1px solid #e1e7f0; border-radius: 13px; overflow: hidden; background: #f5f7fb; }
+.catalog-modal-image img, .catalog-modal-size-image img { display: block; max-width: 100%; max-height: min(43vh, 390px); width: auto; height: auto; object-fit: contain; mix-blend-mode: multiply; }
+.catalog-modal-size-image { background: #fbfcfe; }
+.catalog-modal-size-empty { display: grid; gap: 8px; padding: 18px; text-align: center; }
+.catalog-modal-size-empty strong { color: #6b7890; font-size: 14px; line-height: 1.5; }
+.catalog-modal-size-empty small { color: #9aa5b5; font-size: 9px; line-height: 1.5; }
+.catalog-modal-product-info { display: flex; flex-direction: column; justify-content: center; min-width: 0; padding: 10px 3px; }
 .catalog-modal-product h2 { margin: 4px 0 10px; font-size: 27px; line-height: 1.3; letter-spacing: -.025em; }
 .catalog-modal-product code { color: #5d6b81; font-size: 11px; }
 .catalog-source-note { color: #96a0af; font-size: 9px; }
+.catalog-modal-highlight { display: grid; gap: 5px; margin-top: 26px; padding: 13px 14px; border: 1px solid #dbe5f5; border-radius: 11px; background: #f5f8fd; }
+.catalog-modal-highlight span { color: #8a96a9; font-size: 9px; }
+.catalog-modal-highlight strong { color: var(--ink); font-size: 12px; line-height: 1.55; }
 .catalog-spec-table { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin-top: 25px; overflow: hidden; border: 1px solid #e0e5ed; border-radius: 11px; background: #e0e5ed; }
 .catalog-spec-table div { min-height: 48px; padding: 10px 12px; display: grid; align-content: center; gap: 4px; background: white; }
 .catalog-spec-table span { color: #8b96a7; font-size: 9px; }
diff --git a/app/page.tsx b/app/page.tsx
index 7a05909..2ca6091 100644
--- a/app/page.tsx
+++ b/app/page.tsx
@@ -7,7 +7,7 @@ import {
   type CatalogProduct,
 } from "./catalog-data";
 import { STEERING_WHEEL_ACCESSORIES } from "./catalog-accessories";
-import { getCatalogProductImage } from "./catalog-image-map";
+import { getCatalogProductDimensionImage, getCatalogProductImage } from "./catalog-image-map";
 
 const CATALOG_PRODUCTS = [...RAW_CATALOG_PRODUCTS, ...STEERING_WHEEL_ACCESSORIES].map((product) => ({
   ...product,
@@ -89,6 +89,16 @@ function getFeaturedSpecs(product: CatalogProduct) {
     .map((label) => [label, product.specs[label]] as const);
 }
 
+function getProductDimensionSummary(product: CatalogProduct) {
+  const directSize = product.specs["产品尺寸"] ?? product.specs["外形尺寸"];
+  if (directSize) return directSize;
+
+  const dimensions = ["长（mm）", "宽（mm）", "高（mm）"]
+    .map((label) => product.specs[label])
+    .filter(Boolean);
+  return dimensions.length > 0 ? dimensions.join(" × ") : "尺寸图待补充";
+}
+
 const SERVO_CATEGORIES = ["标准舵机", "异形舵机", "全金属舵机", "大扭矩舵机", "积木舵机"];
 const SILENT_SERVO_CATEGORY = "静音舵机";
 const CUSTOM_SERVO_CATEGORY = "非标准舵机定制";
@@ -387,6 +397,12 @@ export default function Home() {
     requirements.annualVolume === "50000件以上" ||
     Number(requirements.firstOrderQuantity) >= 1000 ||
     requirements.application === "工业设备";
+  const selectedCatalogDimensionImage = selectedCatalogProduct
+    ? getCatalogProductDimensionImage(selectedCatalogProduct)
+    : null;
+  const selectedCatalogDimensionSummary = selectedCatalogProduct
+    ? getProductDimensionSummary(selectedCatalogProduct)
+    : "";
 
   function startSelection() {
     setStage(1);
@@ -1088,20 +1104,42 @@ export default function Home() {
               aria-label="关闭产品详情"
             >×</button>
             <div className="catalog-modal-product">
-              <div className="catalog-modal-image">
-                {selectedCatalogProduct.image ? (
-                  <img src={selectedCatalogProduct.image} alt={selectedCatalogProduct.name} />
-                ) : (
-                  <span className="catalog-placeholder">GAUDELOT</span>
-                )}
+              <div className="catalog-modal-visuals">
+                <div className="catalog-modal-visual-card">
+                  <span className="catalog-modal-visual-label">产品主图</span>
+                  <div className="catalog-modal-image">
+                    {selectedCatalogProduct.image ? (
+                      <img src={selectedCatalogProduct.image} alt={selectedCatalogProduct.name} />
+                    ) : (
+                      <span className="catalog-placeholder">GAUDELOT</span>
+                    )}
+                  </div>
+                </div>
+                <div className="catalog-modal-visual-card">
+                  <span className="catalog-modal-visual-label">产品尺寸</span>
+                  <div className="catalog-modal-size-image">
+                    {selectedCatalogDimensionImage ? (
+                      <img src={selectedCatalogDimensionImage} alt={`${selectedCatalogProduct.name} 产品尺寸`} />
+                    ) : (
+                      <div className="catalog-modal-size-empty">
+                        <strong>{selectedCatalogDimensionSummary}</strong>
+                        <small>当前目录未提供对应尺寸图</small>
+                      </div>
+                    )}
+                  </div>
+                </div>
               </div>
-              <div>
+              <div className="catalog-modal-product-info">
                 <p className="step-kicker">{selectedCatalogProduct.category}</p>
                 <h2 id="catalog-modal-title">{selectedCatalogProduct.name}</h2>
                 <code>{selectedCatalogProduct.code}</code>
                 <p className="catalog-source-note">
                   {selectedCatalogProduct.page > 0 ? `官方产品目录第 ${selectedCatalogProduct.page} 页` : "商城产品资料 · 舵盘配件"}
                 </p>
+                <div className="catalog-modal-highlight">
+                  <span>产品尺寸</span>
+                  <strong>{selectedCatalogDimensionSummary}</strong>
+                </div>
               </div>
             </div>
             <div className="catalog-spec-table">
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