diff --git a/src/renderer/src/views/prepare/index.vue b/src/renderer/src/views/prepare/index.vue
index 16c3696..129dc65 100644
--- a/src/renderer/src/views/prepare/index.vue
+++ b/src/renderer/src/views/prepare/index.vue
@@ -491,6 +491,8 @@ export default {
 
     // 打开PDF-课件
     async navtoPdf() {
+      const toolStore = useToolState()
+      if (toolStore.isPdfWin) return this.$message.error('您当前已打开课本，请勿重复操作')
       let path = await this.getBookPathFromServer()
       // console.log(path)
       // console.log(this.uploadData.textbookId)