diff --git a/AIStudyApp/AIStudyApp/Features/Library/LibrarySubpages.swift b/AIStudyApp/AIStudyApp/Features/Library/LibrarySubpages.swift
index 997c14a..d8026a6 100644
--- a/AIStudyApp/AIStudyApp/Features/Library/LibrarySubpages.swift
+++ b/AIStudyApp/AIStudyApp/Features/Library/LibrarySubpages.swift
@@ -1109,6 +1109,28 @@ struct KnowledgeDetailPage: View {
                                         .padding(16).background(Color.zxFill004).clipShape(RoundedRectangle(cornerRadius: 14))
                                 }
                                 Text(content).font(.system(size: 14)).foregroundColor(Color.zxF0).lineSpacing(6)
+
+                                // 阅读原文件 button
+                                if let path = vm.localPath ?? (try? writeTempFile(content: content, itemId: item.id)), let mt = vm.detectedType ?? detectTypeFromContent(content, sourceType: item.sourceType) {
+                                    NavigationLink(value: Route.materialReader(
+                                        materialId: item.id,
+                                        filePath: path,
+                                        materialType: mt,
+                                        knowledgeBaseId: item.knowledgeBaseId,
+                                        title: item.title
+                                    )) {
+                                        HStack(spacing: 8) {
+                                            Image(systemName: "book")
+                                            Text("阅读原文件")
+                                        }
+                                        .font(.system(size: 15, weight: .bold))
+                                        .foregroundColor(.white)
+                                        .frame(maxWidth: .infinity).frame(height: 48)
+                                        .background(LinearGradient(colors: [Color.zxPurple, Color.zxAccent], startPoint: .leading, endPoint: .trailing))
+                                        .clipShape(RoundedRectangle(cornerRadius: 14))
+                                    }
+                                    .padding(.top, 8)
+                                }
                             }.padding(.horizontal, 20).padding(.top, 8).padding(.bottom, 100)
                         }.scrollIndicators(.hidden)
                     }
@@ -1452,3 +1474,30 @@ struct EditKnowledgePage: View {
         }.navigationBarTitleDisplayMode(.inline).toolbarBackground(.hidden, for: .navigationBar).toolbar(.hidden, for: .tabBar)
     }
 }
+
+// MARK: - Helpers
+
+private func writeTempFile(content: String, itemId: String) throws -> String {
+    let dir = FileManager.default.temporaryDirectory
+    let url = dir.appendingPathComponent("kd_text_\(itemId).md")
+    try content.write(to: url, atomically: true, encoding: .utf8)
+    return url.path
+}
+
+private func detectTypeFromContent(_ content: String, sourceType: String?) -> MaterialType? {
+    if let st = sourceType {
+        switch st.lowercased() {
+        case "markdown", "md": return .markdown
+        case "txt", "text": return .text
+        case "pdf": return .pdf
+        case "epub": return .epub
+        case "docx", "doc": return .word
+        case "xlsx", "xls": return .excel
+        case "pptx", "ppt": return .powerPoint
+        default: break
+        }
+    }
+    // Detect from content
+    if content.hasPrefix("#") || content.contains("```") { return .markdown }
+    return .text
+}