diff --git a/.chronus/changes/scalar_doc-2024-3-2-17-15-13.md b/.chronus/changes/scalar_doc-2024-3-2-17-15-13.md
new file mode 100644
index 0000000000..f03d6ded4f
--- /dev/null
+++ b/.chronus/changes/scalar_doc-2024-3-2-17-15-13.md
@@ -0,0 +1,7 @@
+---
+changeKind: feature
+packages:
+  - "@azure-tools/typespec-client-generator-core"
+---
+
+support sclar doc
\ No newline at end of file
diff --git a/packages/typespec-client-generator-core/src/interfaces.ts b/packages/typespec-client-generator-core/src/interfaces.ts
index 3610b91076..a8ac160dcb 100644
--- a/packages/typespec-client-generator-core/src/interfaces.ts
+++ b/packages/typespec-client-generator-core/src/interfaces.ts
@@ -85,6 +85,8 @@ interface SdkTypeBase {
    */
   nullable: boolean;
   deprecation?: string;
+  description?: string;
+  details?: string;
 }
 
 export type SdkType =
@@ -241,8 +243,6 @@ export interface SdkEnumType extends SdkTypeBase {
   valueType: SdkBuiltInType;
   values: SdkEnumValueType[];
   isFixed: boolean;
-  description?: string;
-  details?: string;
   isFlags: boolean;
   usage: UsageFlags;
   access?: AccessFlags;
@@ -257,8 +257,6 @@ export interface SdkEnumValueType extends SdkTypeBase {
   value: string | number;
   enumType: SdkEnumType;
   valueType: SdkBuiltInType;
-  description?: string;
-  details?: string;
 }
 export interface SdkConstantType extends SdkTypeBase {
   kind: "constant";
@@ -288,8 +286,6 @@ export interface SdkModelType extends SdkTypeBase {
    */
   isError: boolean;
   isGeneratedName: boolean;
-  description?: string;
-  details?: string;
   access?: AccessFlags;
   usage: UsageFlags;
   additionalProperties?: SdkType;
diff --git a/packages/typespec-client-generator-core/src/types.ts b/packages/typespec-client-generator-core/src/types.ts
index 1cb205d98f..85f27c8a5a 100644
--- a/packages/typespec-client-generator-core/src/types.ts
+++ b/packages/typespec-client-generator-core/src/types.ts
@@ -208,9 +208,12 @@ function getSdkBuiltInTypeWithDiagnostics(
         kind = getScalarKind(type);
       }
     }
+    const docWrapper = getDocHelper(context, type);
     return diagnostics.wrap({
       ...getSdkTypeBaseHelper(context, type, kind),
       encode: getEncodeHelper(context, type, kind),
+      description: docWrapper.description,
+      details: docWrapper.details,
     });
   } else if (type.kind === "String" || type.kind === "Boolean" || type.kind === "Number") {
     let kind: SdkBuiltInKinds;
@@ -779,6 +782,9 @@ export function getClientTypeWithDiagnostics(
         retval = getKnownValuesEnum(context, type, operation) ?? baseType;
         const namespace = type.namespace ? getNamespaceFullName(type.namespace) : "";
         retval.kind = context.knownScalars[`${namespace}.${type.name}`] ?? retval.kind;
+        const docWrapper = getDocHelper(context, type);
+        retval.description = docWrapper.description;
+        retval.details = docWrapper.details;
         break;
       }
       if (type.name === "utcDateTime" || type.name === "offsetDateTime") {
diff --git a/packages/typespec-client-generator-core/test/types.test.ts b/packages/typespec-client-generator-core/test/types.test.ts
index 3912dc0a32..2fb3e72019 100644
--- a/packages/typespec-client-generator-core/test/types.test.ts
+++ b/packages/typespec-client-generator-core/test/types.test.ts
@@ -263,6 +263,25 @@ describe("typespec-client-generator-core: types", () => {
         }
       }
     });
+    it("with doc", async () => {
+      await runner.compileWithBuiltInService(
+        `
+        @doc("doc")
+        @summary("title")
+        scalar TestScalar extends string;
+        
+        @usage(Usage.input | Usage.output)
+        @access(Access.public)
+        model Test {
+          prop: TestScalar;
+        }
+      `
+      );
+      const models = getAllModels(runner.context);
+      strictEqual(models[0].kind, "model");
+      strictEqual(models[0].properties[0].type.description, "title");
+      strictEqual(models[0].properties[0].type.details, "doc");
+    });
   });
   describe("SdkDurationType", () => {
     it("default", async function () {
@@ -333,9 +352,11 @@ describe("typespec-client-generator-core: types", () => {
     it("float seconds decorated scalar", async function () {
       await runner.compileWithBuiltInService(
         `
+        @doc("doc")
+        @summary("title")
         @encode(DurationKnownEncoding.seconds, float32)
         scalar Float32Duration extends duration;
-
+        
         @usage(Usage.input | Usage.output)
         @access(Access.public)
         model Test {
@@ -348,6 +369,8 @@ describe("typespec-client-generator-core: types", () => {
       strictEqual(sdkType.valueType.kind, "duration");
       strictEqual(sdkType.valueType.wireType.kind, "float32");
       strictEqual(sdkType.valueType.encode, "seconds");
+      strictEqual(sdkType.valueType.description, "title");
+      strictEqual(sdkType.valueType.details, "doc");
     });
   });
 
@@ -420,6 +443,8 @@ describe("typespec-client-generator-core: types", () => {
     it("unixTimestamp array", async function () {
       await runner.compileWithBuiltInService(
         `
+        @doc("doc")
+        @summary("title")
         @encode(DateTimeKnownEncoding.unixTimestamp, int64)
         scalar unixTimestampDatetime extends utcDateTime;
 
@@ -435,6 +460,8 @@ describe("typespec-client-generator-core: types", () => {
       strictEqual(sdkType.valueType.kind, "utcDateTime");
       strictEqual(sdkType.valueType.wireType.kind, "int64");
       strictEqual(sdkType.valueType.encode, "unixTimestamp");
+      strictEqual(sdkType.valueType.description, "title");
+      strictEqual(sdkType.valueType.details, "doc");
     });
   });
   describe("SdkUnionType", () => {