diff --git a/.chronus/changes/fix_discriminator_name-2024-3-2-17-50-27.md b/.chronus/changes/fix_discriminator_name-2024-3-2-17-50-27.md
new file mode 100644
index 0000000000..5652fa67f7
--- /dev/null
+++ b/.chronus/changes/fix_discriminator_name-2024-3-2-17-50-27.md
@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@azure-tools/typespec-client-generator-core"
+---
+
+fix discriminator propert renaming issue
\ No newline at end of file
diff --git a/packages/typespec-client-generator-core/src/types.ts b/packages/typespec-client-generator-core/src/types.ts
index 397190c9c6..2c3645cdd3 100644
--- a/packages/typespec-client-generator-core/src/types.ts
+++ b/packages/typespec-client-generator-core/src/types.ts
@@ -416,7 +416,7 @@ function addDiscriminatorToModelType(
       updateModelsMap(context, childModel, childModelSdkType, operation);
       for (const property of childModelSdkType.properties) {
         if (property.kind === "property") {
-          if (property.serializedName === discriminator?.propertyName) {
+          if (property.__raw?.name === discriminator?.propertyName) {
             if (property.type.kind !== "constant" && property.type.kind !== "enumvalue") {
               diagnostics.add(
                 createDiagnostic({
@@ -451,7 +451,7 @@ function addDiscriminatorToModelType(
     }
     for (let i = 0; i < model.properties.length; i++) {
       const property = model.properties[i];
-      if (property.kind === "property" && property.serializedName === discriminator.propertyName) {
+      if (property.kind === "property" && property.__raw?.name === discriminator.propertyName) {
         property.discriminator = true;
         model.discriminatorProperty = property;
         return diagnostics.wrap(undefined);
@@ -471,18 +471,22 @@ function addDiscriminatorToModelType(
         encode: "string",
       };
     }
-    const name = discriminator.propertyName;
+    const name = discriminatorProperty ? discriminatorProperty.name : discriminator.propertyName;
     model.properties.splice(0, 0, {
       kind: "property",
       optional: false,
       discriminator: true,
-      serializedName: discriminator.propertyName,
+      serializedName: discriminatorProperty
+        ? discriminatorProperty.serializedName
+        : discriminator.propertyName,
       type: discriminatorType!,
       nameInClient: name,
       name,
       isGeneratedName: false,
       onClient: false,
-      apiVersions: getAvailableApiVersions(context, type),
+      apiVersions: discriminatorProperty
+        ? getAvailableApiVersions(context, discriminatorProperty.__raw!)
+        : getAvailableApiVersions(context, type),
       isApiVersionParam: false,
       isMultipartFileInput: false, // discriminator property cannot be a file
       flatten: false, // discriminator properties can not be flattened
diff --git a/packages/typespec-client-generator-core/test/types.test.ts b/packages/typespec-client-generator-core/test/types.test.ts
index 6977f894b9..a935deab2e 100644
--- a/packages/typespec-client-generator-core/test/types.test.ts
+++ b/packages/typespec-client-generator-core/test/types.test.ts
@@ -2200,6 +2200,39 @@ describe("typespec-client-generator-core: types", () => {
       strictEqual(kindType.isFixed, false);
     });
 
+    it("discriminator rename", async () => {
+      await runner.compileWithBuiltInService(`
+      @discriminator("kind")
+      model Fish {
+        @clientName("type")
+        @encodedName("application/json", "@data.kind")
+        kind: string;
+        age: int32;
+      }
+
+      model Salmon extends Fish {
+        kind: "salmon";
+        friends?: Fish[];
+        hate?: Record<Fish>;
+        partner?: Fish;
+      }
+
+      @get
+      op getModel(): Fish;
+      `);
+      const models = runner.context.experimental_sdkPackage.models;
+      strictEqual(models.length, 2);
+      const fish = models.find((x) => x.name === "Fish");
+      ok(fish);
+      strictEqual(fish.properties.length, 2);
+      const discriminatorProperty = fish.properties.find((x) => x.name === "type");
+      ok(discriminatorProperty);
+      strictEqual(discriminatorProperty.kind, "property");
+      strictEqual(discriminatorProperty.discriminator, true);
+      strictEqual(discriminatorProperty.type.kind, "string");
+      strictEqual(discriminatorProperty.serializedName, "@data.kind");
+    });
+
     it("filterOutCoreModels true", async () => {
       const runnerWithCore = await createSdkTestRunner({
         librariesToAdd: [AzureCoreTestLibrary],