diff --git a/reading-platform-frontend/src/api/package.ts b/reading-platform-frontend/src/api/package.ts
index 30ae1c6..48ec87a 100644
--- a/reading-platform-frontend/src/api/package.ts
+++ b/reading-platform-frontend/src/api/package.ts
@@ -3,7 +3,7 @@ import { http } from './index';
 // ==================== 套餐管理 ====================
 
 export interface CoursePackage {
-  id: number;
+  id: number | string;  // 后端 Long 序列化为 string，避免 JS 精度丢失
   name: string;
   description?: string;
   price: number;
@@ -22,7 +22,7 @@ export interface CoursePackage {
 }
 
 export interface PackageCourse {
-  id: number;              // 课程 ID
+  id: number | string;     // 课程 ID，后端 Long 序列化为 string
   name: string;            // 课程名称
   gradeLevel: string;      // 适用年级
   sortOrder: number;       // 排序号
@@ -48,8 +48,8 @@ export function getPackageList(params?: PackageListParams) {
   return http.get<{ list: CoursePackage[]; total: number; pageNum: number; pageSize: number; pages: number }>('/v1/admin/packages', { params });
 }
 
-// 获取套餐详情
-export function getPackageDetail(id: number) {
+// 获取套餐详情（id 支持 number | string，避免大整数精度丢失）
+export function getPackageDetail(id: number | string) {
   return http.get(`/v1/admin/packages/${id}`);
 }
 
@@ -59,53 +59,54 @@ export function createPackage(data: CreatePackageData) {
 }
 
 // 更新套餐
-export function updatePackage(id: number, data: Partial<CreatePackageData>) {
+export function updatePackage(id: number | string, data: Partial<CreatePackageData>) {
   return http.put(`/v1/admin/packages/${id}`, data);
 }
 
 // 删除套餐
-export function deletePackage(id: number) {
+export function deletePackage(id: number | string) {
   return http.delete(`/v1/admin/packages/${id}`);
 }
 
-// 设置套餐课程
+// 设置套餐课程（后端期望 JSON 数组 [courseId1, courseId2, ...]）
 export function setPackageCourses(
-  packageId: number,
-  courses: { courseId: number; gradeLevel: string; sortOrder?: number }[],
+  packageId: number | string,
+  courses: { courseId: number; gradeLevel?: string; sortOrder?: number }[],
 ) {
-  return http.put(`/v1/admin/packages/${packageId}/courses`, { courses });
+  const courseIds = courses.map((c) => c.courseId);
+  return http.put(`/v1/admin/packages/${packageId}/courses`, courseIds);
 }
 
 // 添加课程到套餐
 export function addCourseToPackage(
-  packageId: number,
+  packageId: number | string,
   data: { courseId: number; gradeLevel: string; sortOrder?: number },
 ) {
   return http.post(`/v1/admin/packages/${packageId}/courses`, data);
 }
 
 // 从套餐移除课程
-export function removeCourseFromPackage(packageId: number, courseId: number) {
+export function removeCourseFromPackage(packageId: number | string, courseId: number | string) {
   return http.delete(`/v1/admin/packages/${packageId}/courses/${courseId}`);
 }
 
 // 提交审核
-export function submitPackage(id: number) {
+export function submitPackage(id: number | string) {
   return http.post(`/v1/admin/packages/${id}/submit`);
 }
 
 // 审核套餐
-export function reviewPackage(id: number, data: { approved: boolean; comment?: string }) {
+export function reviewPackage(id: number | string, data: { approved: boolean; comment?: string }) {
   return http.post(`/v1/admin/packages/${id}/review`, data);
 }
 
 // 发布套餐
-export function publishPackage(id: number) {
+export function publishPackage(id: number | string) {
   return http.post(`/v1/admin/packages/${id}/publish`);
 }
 
 // 下架套餐
-export function offlinePackage(id: number) {
+export function offlinePackage(id: number | string) {
   return http.post(`/v1/admin/packages/${id}/offline`);
 }
 
diff --git a/reading-platform-frontend/src/views/admin/packages/PackageDetailView.vue b/reading-platform-frontend/src/views/admin/packages/PackageDetailView.vue
index b2b0e2d..f689c60 100644
--- a/reading-platform-frontend/src/views/admin/packages/PackageDetailView.vue
+++ b/reading-platform-frontend/src/views/admin/packages/PackageDetailView.vue
@@ -106,7 +106,7 @@ const formatDate = (date?: string) => {
 const fetchData = async () => {
   loading.value = true;
   try {
-    const id = Number(route.params.id);
+    const id = route.params.id as string;
     const res = await getPackageDetail(id);
     pkg.value = res;
   } catch (error) {
@@ -122,7 +122,7 @@ const handleEdit = () => {
 
 const handleSubmit = async () => {
   try {
-    await submitPackage(Number(route.params.id));
+    await submitPackage(route.params.id as string);
     message.success('提交成功');
     fetchData();
   } catch (error) {
@@ -132,7 +132,7 @@ const handleSubmit = async () => {
 
 const handlePublish = async () => {
   try {
-    await publishPackage(Number(route.params.id));
+    await publishPackage(route.params.id as string);
     message.success('发布成功');
     fetchData();
   } catch (error) {
diff --git a/reading-platform-frontend/src/views/admin/packages/PackageEditView.vue b/reading-platform-frontend/src/views/admin/packages/PackageEditView.vue
index ae73dcc..adf2040 100644
--- a/reading-platform-frontend/src/views/admin/packages/PackageEditView.vue
+++ b/reading-platform-frontend/src/views/admin/packages/PackageEditView.vue
@@ -125,13 +125,13 @@ const router = useRouter();
 const route = useRoute();
 
 const isEdit = computed(() => !!route.params.id);
-const packageId = computed(() => Number(route.params.id));
+const packageId = computed(() => route.params.id as string | undefined);
 
 const saving = ref(false);
 const loadingCourses = ref(false);
 const showCourseSelector = ref(false);
 const availableCourses = ref<any[]>([]);
-const selectedRowKeys = ref<number[]>([]);
+const selectedRowKeys = ref<(number | string)[]>([]);
 
 const form = reactive({
   name: '',
@@ -142,7 +142,7 @@ const form = reactive({
   gradeLevels: [] as string[],
 });
 
-const selectedCourses = ref<{ courseId: number; gradeLevel: string; sortOrder: number; courseName: string }[]>([]);
+const selectedCourses = ref<{ courseId: number | string; gradeLevel: string; sortOrder: number; courseName: string }[]>([]);
 
 const courseColumns = [
   { title: '课程包', dataIndex: 'courseName', key: 'courseName' },
@@ -239,12 +239,13 @@ const handleSave = async () => {
       gradeLevels: form.gradeLevels,
     };
 
-    let id = packageId.value;
+    let id: number | string;
     if (isEdit.value) {
+      id = packageId.value!;
       await updatePackage(id, data);
     } else {
       const res = await createPackage(data) as any;
-      id = res.id;
+      id = res.id;  // 后端 Long 序列化为 string
     }
 
     // 保存课程关联
diff --git a/reading-platform-java/src/main/java/com/reading/platform/common/config/JacksonConfig.java b/reading-platform-java/src/main/java/com/reading/platform/common/config/JacksonConfig.java
new file mode 100644
index 0000000..3fff912
--- /dev/null
+++ b/reading-platform-java/src/main/java/com/reading/platform/common/config/JacksonConfig.java
@@ -0,0 +1,22 @@
+package com.reading.platform.common.config;
+
+import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
+import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Jackson 配置：将 Long 序列化为 String，避免前端 JavaScript 精度丢失。
+ * JavaScript Number 只能安全表示 2^53 以内的整数，雪花 ID 等大整数会丢失精度。
+ */
+@Configuration
+public class JacksonConfig {
+
+    @Bean
+    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
+        return builder -> {
+            builder.serializerByType(Long.class, ToStringSerializer.instance);
+            builder.serializerByType(Long.TYPE, ToStringSerializer.instance);
+        };
+    }
+}