diff --git a/Src/nmNum/nmCalculation/nmCalculationAutoFitLM.cpp b/Src/nmNum/nmCalculation/nmCalculationAutoFitLM.cpp
index 3505ed8..04dae91 100644
--- a/Src/nmNum/nmCalculation/nmCalculationAutoFitLM.cpp
+++ b/Src/nmNum/nmCalculation/nmCalculationAutoFitLM.cpp
@@ -780,10 +780,10 @@ void nmCalculationAutoFitLM::setTargetWellName(const QString& wellName)
 
 void nmCalculationAutoFitLM::initializeTraceFile()
 {
-    // LM 轨迹独立保存在应用目录，不依赖机器学习目录或外部评分进程。
+    // LM 轨迹独立保存在系统临时目录，避免在应用目录堆积诊断文件。
     closeTraceFile();
     m_traceRunId = QDateTime::currentDateTime().toString("yyyyMMdd_hhmmss_zzz");
-    QDir traceDir(QDir(QApplication::applicationDirPath()).absoluteFilePath("autofit_lm_trace"));
+    QDir traceDir(QDir(QDir::tempPath()).absoluteFilePath("autofit_lm_trace"));
 
     if(!traceDir.exists() && !QDir().mkpath(traceDir.absolutePath())) {
         DEBUG_OUT(QString("Failed to create LM trace directory: %1").arg(traceDir.absolutePath()));