diff --git a/api/dbus/org.desktopspec.MimeManager1.xml b/api/dbus/org.desktopspec.MimeManager1.xml
index 370b3f2f..3e04beb0 100644
--- a/api/dbus/org.desktopspec.MimeManager1.xml
+++ b/api/dbus/org.desktopspec.MimeManager1.xml
@@ -25,5 +25,11 @@
             <arg name="applications_and_properties" type="a{oa{sa{sv}}}" direction="out"/>
             <annotation name="org.qtproject.QtDBus.QtTypeName.Out0" value="ObjectMap"/>
         </method>
+        <signal name="MimeInfoReloaded">
+            <annotation
+                name="org.freedesktop.DBus.Description"
+                value="Signal emitted when the mime infos are reloaded."
+            />
+        </signal>
     </interface>
 </node>
diff --git a/src/dbus/applicationmanager1service.cpp b/src/dbus/applicationmanager1service.cpp
index 3c19bb1e..13802517 100644
--- a/src/dbus/applicationmanager1service.cpp
+++ b/src/dbus/applicationmanager1service.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 #include "applicationadaptor.h"
@@ -274,6 +274,13 @@ void ApplicationManager1Service::scanMimeInfos() noexcept
     }
 }
 
+void ApplicationManager1Service::reloadMimeInfos() noexcept
+{
+    m_mimeManager->reset();
+    scanMimeInfos();
+    emit m_mimeManager->MimeInfoReloaded();
+}
+
 void ApplicationManager1Service::scanApplications() noexcept
 {
     const auto &desktopFileDirs = getDesktopFileDirs();
@@ -639,8 +646,7 @@ void ApplicationManager1Service::doReloadApplications()
         removeOneApplication(appId);
     }
 
-    m_mimeManager->reset();
-    scanMimeInfos();
+    reloadMimeInfos();
     updateAutostartStatus();
 }
 
diff --git a/src/dbus/applicationmanager1service.h b/src/dbus/applicationmanager1service.h
index ac232703..326a7091 100644
--- a/src/dbus/applicationmanager1service.h
+++ b/src/dbus/applicationmanager1service.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
@@ -41,6 +41,7 @@ class ApplicationManager1Service final : public QObject, protected QDBusContext
     [[nodiscard]] QList<QDBusObjectPath> list() const;
 
     void initService(QDBusConnection &connection) noexcept;
+    void reloadMimeInfos() noexcept;
     QSharedPointer<ApplicationService> addApplication(DesktopFile desktopFileSource) noexcept;
     void removeOneApplication(const QString &appId) noexcept;
     void removeAllApplication() noexcept;
diff --git a/src/dbus/mimemanager1service.cpp b/src/dbus/mimemanager1service.cpp
index 87dabf84..78358e6a 100644
--- a/src/dbus/mimemanager1service.cpp
+++ b/src/dbus/mimemanager1service.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 #include <QProcess>
@@ -15,6 +15,21 @@ MimeManager1Service::MimeManager1Service(ApplicationManager1Service *parent)
     if (adaptor == nullptr or !registerObjectToDBus(this, DDEApplicationManager1MimeManager1ObjectPath, MimeManager1Interface)) {
         std::terminate();
     }
+
+    // 监控用户配置目录下的 mimeapps.list 文件
+    connect(&m_mimeAppsWatcher, &QFileSystemWatcher::fileChanged, this, &MimeManager1Service::onMimeAppsFileChanged);
+
+    // 添加用户配置目录下的 mimeapps.list 文件到监控
+    QString userMimeAppsFile = getXDGConfigHome() + "/mimeapps.list";
+    if (QFileInfo::exists(userMimeAppsFile)) {
+        m_mimeAppsWatcher.addPath(userMimeAppsFile);
+    } else {
+        qWarning() << "User mimeapps.list file does not exist:" << userMimeAppsFile;
+    }
+
+    m_mimeAppsDebounceTimer.setSingleShot(true);
+    m_mimeAppsDebounceTimer.setInterval(50);
+    connect(&m_mimeAppsDebounceTimer, &QTimer::timeout, this, &MimeManager1Service::handleMimeAppsFileDebounced);
 }
 
 MimeManager1Service::~MimeManager1Service() = default;
@@ -106,12 +121,15 @@ void MimeManager1Service::setDefaultApplication(const QStringMap &defaultApps) n
         return;
     }
 
+    m_internalWriteInProgress = true;
     for (auto it = defaultApps.constKeyValueBegin(); it != defaultApps.constKeyValueEnd(); ++it) {
         userConfig->setDefaultApplication(it->first, it->second);
     }
 
     if (!userConfig->writeToFile()) {
         safe_sendErrorReply(QDBusError::Failed, "set default app failed, these config will be reset after re-login.");
+        m_internalWriteInProgress = false;
+        return;
     }
 }
 
@@ -126,12 +144,15 @@ void MimeManager1Service::unsetDefaultApplication(const QStringList &mimeTypes)
         return;
     }
 
+    m_internalWriteInProgress = true;
     for (const auto &mime : mimeTypes) {
         userConfig->unsetDefaultApplication(mime);
     }
 
     if (!userConfig->writeToFile()) {
         safe_sendErrorReply(QDBusError::Failed, "unset default app failed, these config will be reset after re-login.");
+        m_internalWriteInProgress = false;
+        return;
     }
 }
 
@@ -156,3 +177,29 @@ void MimeManager1Service::updateMimeCache(QString dir) noexcept
     }
 
 }
+
+void MimeManager1Service::onMimeAppsFileChanged(const QString &path)
+{
+    if (!m_mimeAppsWatcher.files().contains(path) && QFileInfo::exists(path)) {
+        m_mimeAppsWatcher.addPath(path);
+    }
+
+    // 如果是内部写入导致的文件变化，忽略
+    if (m_internalWriteInProgress) {
+        m_internalWriteInProgress = false;
+        return;
+    }
+
+    m_mimeAppsDebounceTimer.start();
+}
+
+void MimeManager1Service::handleMimeAppsFileDebounced()
+{
+    auto *parentService = qobject_cast<ApplicationManager1Service *>(parent());
+    if (!parentService) {
+        return;
+    }
+
+    qInfo() << "Reloading MIME info due to external configuration change.";
+    parentService->reloadMimeInfos();
+}
diff --git a/src/dbus/mimemanager1service.h b/src/dbus/mimemanager1service.h
index 7849549c..8f942a3c 100644
--- a/src/dbus/mimemanager1service.h
+++ b/src/dbus/mimemanager1service.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2023 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: LGPL-3.0-or-later
 
@@ -8,6 +8,9 @@
 #include <QObject>
 #include <QDBusContext>
 #include <QDBusObjectPath>
+#include <QFileSystemWatcher>
+#include <QTimer>
+
 #include "global.h"
 #include "applicationmimeinfo.h"
 
@@ -32,9 +35,20 @@ public Q_SLOTS:
     void setDefaultApplication(const QStringMap &defaultApps) noexcept;
     void unsetDefaultApplication(const QStringList &mimeTypes) noexcept;
 
+Q_SIGNALS:
+    void MimeInfoReloaded();
+
+private Q_SLOTS:
+    void onMimeAppsFileChanged(const QString &path);
+    void handleMimeAppsFileDebounced();
+
 private:
     QMimeDatabase m_database;
     std::vector<MimeInfo> m_infos;
+    QFileSystemWatcher m_mimeAppsWatcher;
+    // 内部写入标志，用于避免触发外部修改的处理
+    bool m_internalWriteInProgress{false};
+    QTimer m_mimeAppsDebounceTimer;
 };
 
 #endif
diff --git a/toolGenerate/qdbusxml2cpp/org.desktopspec.MimeManager1Adaptor.h b/toolGenerate/qdbusxml2cpp/org.desktopspec.MimeManager1Adaptor.h
index 80f64f2d..3a620434 100644
--- a/toolGenerate/qdbusxml2cpp/org.desktopspec.MimeManager1Adaptor.h
+++ b/toolGenerate/qdbusxml2cpp/org.desktopspec.MimeManager1Adaptor.h
@@ -51,6 +51,9 @@ class MimeManager1Adaptor: public QDBusAbstractAdaptor
 "      <arg direction=\"out\" type=\"a{oa{sa{sv}}}\" name=\"applications_and_properties\"/>\n"
 "      <annotation value=\"ObjectMap\" name=\"org.qtproject.QtDBus.QtTypeName.Out0\"/>\n"
 "    </method>\n"
+"    <signal name=\"MimeInfoReloaded\">\n"
+"      <annotation value=\"Signal emitted when the mime infos are reloaded.\" name=\"org.freedesktop.DBus.Description\"/>\n"
+"    </signal>\n"
 "  </interface>\n"
         "")
 public:
@@ -64,6 +67,7 @@ public Q_SLOTS: // METHODS
     void setDefaultApplication(const QStringMap &defaultApps);
     void unsetDefaultApplication(const QStringList &mimeTypes);
 Q_SIGNALS: // SIGNALS
+    void MimeInfoReloaded();
 };
 
 #endif