diff --git a/src/dconfigfile.cpp b/src/dconfigfile.cpp
index 54ff4d03..d4222f7e 100644
--- a/src/dconfigfile.cpp
+++ b/src/dconfigfile.cpp
@@ -52,6 +52,12 @@ inline static bool isValidFilename(const QString& filename)
     QRegularExpressionMatch match = regex.match(filename);
     return match.hasMatch();
 }
+inline static bool isValidAppId(const QString& appId)
+{
+    if (appId.contains(' '))
+        return false;
+    return isValidFilename(appId);
+}
 /*!
 @~english
   \internal
@@ -689,6 +695,10 @@ class Q_DECL_HIDDEN DConfigMetaImpl : public DConfigMeta {
 
     bool load(const QString &localPrefix) override
     {
+        if (!isValidAppId(configKey.appId)) {
+            qCWarning(cfLog, "AppId is invalid, appId=%s", qPrintable(configKey.appId));
+            return false;
+        }
         if (!isValidFilename(configKey.fileName)) {
             qCWarning(cfLog, "Name is invalid, filename=%s", qPrintable(configKey.fileName));
             return false;
diff --git a/tests/ut_dconfigfile.cpp b/tests/ut_dconfigfile.cpp
index 2ad38677..5d692325 100644
--- a/tests/ut_dconfigfile.cpp
+++ b/tests/ut_dconfigfile.cpp
@@ -517,3 +517,24 @@ INSTANTIATE_TEST_SUITE_P(checkName, ut_DConfigFileCheckName,
                              std::tuple{QString("org/foo"), false},
                              std::tuple{QString("./org-foo"), false},
                              std::tuple{QString("../configs/org-foo"), false}));
+
+class ut_DConfigFileCheckAppId : public ut_DConfigFile, public ::testing::WithParamInterface<std::tuple<QString, bool>>
+{
+
+};
+
+TEST_P(ut_DConfigFileCheckAppId, checkAppId)
+{
+    const auto [appId, isValid] = GetParam();
+    FileCopyGuard guard(":/data/dconf-example.meta.json", QString("%1/%2/%3.json").arg(noAppidMetaPath, appId, FILE_NAME));
+    DConfigFile config(appId, FILE_NAME);
+    ASSERT_EQ(config.load(LocalPrefix), isValid);
+}
+INSTANTIATE_TEST_SUITE_P(checkAppId, ut_DConfigFileCheckAppId,
+                         ::testing::Values(
+                             std::tuple{QString("org-foo"), true},
+                             std::tuple{QString("org foo"), false},
+                             std::tuple{QString("org.foo2"), true},
+                             std::tuple{QString("org/foo"), false},
+                             std::tuple{QString("./org-foo"), false},
+                             std::tuple{QString("../configs/org-foo"), false}));