diff --git a/application/logbackend.cpp b/application/logbackend.cpp
index 87070e1f..166e1eac 100644
--- a/application/logbackend.cpp
+++ b/application/logbackend.cpp
@@ -444,6 +444,12 @@ bool LogBackend::exportAppLogsByCondition(const QString &outDir, const QString &
         }
     }
 
+    // 级别有效性判断
+    if (!level.isEmpty() && level2Id(level) == -2) {
+        qCWarning(logBackend) << "invalid level parameter: " << level;
+        return false;
+    }
+
     qCInfo(logBackend) << "appName:" << appName << "period:" << period << "level:" << level << "keyword:" << keyword;
 
     TIME_RANGE timeRange = getTimeRange(periodId);
@@ -809,16 +815,15 @@ void LogBackend::onExportProgress(int nCur, int nTotal)
 
 void LogBackend::onExportResult(bool isSuccess)
 {
+    Utils::resetToNormalAuth(m_outPath);
+
     if (isSuccess) {
         qCInfo(logBackend) << "export success.";
-
+        qApp->quit();
     } else {
         qCWarning(logBackend) << "export failed.";
+        qApp->exit(-1);
     }
-
-    Utils::resetToNormalAuth(m_outPath);
-
-    qApp->exit(-1);
 }
 
 QList<LOG_MSG_BOOT> LogBackend::filterBoot(BOOT_FILTERS ibootFilter, const QList<LOG_MSG_BOOT> &iList)
@@ -1064,6 +1069,23 @@ bool LogBackend::parseData(const LOG_FLAG &flag, const QString &period, const QS
         }
     }
 
+    // 常规级别有效性判断
+    if (flag == JOURNAL || flag == Dmesg || flag == BOOT_KLU || flag == APP) {
+        if (!condition.isEmpty() && level2Id(condition) == -2) {
+            qCWarning(logBackend) << "invalid level parameter: " << condition;
+            return false;
+        }
+
+    }
+
+    // dnf级别有效性判断
+    if (flag == Dnf) {
+        if (!condition.isEmpty() && dnfLevel2Id(condition) == DNFINVALID) {
+            qCWarning(logBackend) << "invalid level parameter: " << condition;
+            return false;
+        }
+    }
+
     qCInfo(logBackend) << "parsing ..." << "period:" << period << "condition:" << condition << "keyword:" << m_currentSearchStr;
 
     TIME_RANGE timeRange = getTimeRange(periodId);
@@ -1530,7 +1552,7 @@ BUTTONID LogBackend::period2Enum(const QString &period)
 
 int LogBackend::level2Id(const QString &level)
 {
-    int lId = -1;
+    int lId = -2;
     if (level == "debug" || level == "7")
         lId = 7;
     if (level == "info" || level == "6")
@@ -1547,13 +1569,15 @@ int LogBackend::level2Id(const QString &level)
         lId = 1;
     else if (level == "emerg" || level == "0")
         lId = 0;
+    else if (level == "all")
+        lId = -1;
 
     return lId;
 }
 
 DNFPRIORITY LogBackend::dnfLevel2Id(const QString &level)
 {
-    DNFPRIORITY eId = DNFLVALL;
+    DNFPRIORITY eId = DNFINVALID;
     if (level == "trace" || level == "6")
         eId = TRACE;
     else if (level == "debug" || level == "5")
@@ -1568,6 +1592,8 @@ DNFPRIORITY LogBackend::dnfLevel2Id(const QString &level)
         eId = CRITICAL;
     else if (level == "supercritical" || level == "supercrit" || level == "0")
         eId = SUPERCRITICAL;
+    else if (level == "all")
+        eId = DNFLVALL;
 
     return eId;
 }
diff --git a/application/structdef.h b/application/structdef.h
index e5178f25..6276a702 100644
--- a/application/structdef.h
+++ b/application/structdef.h
@@ -70,7 +70,8 @@ enum PRIORITY { LVALL = -1,
                 NOTICE,
                 INF,
                 DEB };
-enum DNFPRIORITY { DNFLVALL = -1,
+enum DNFPRIORITY { DNFINVALID = -2,
+                   DNFLVALL,
                    TRACE,
                    SUBDEBUG,
                    DDEBUG,