diff --git a/Bin/Config/Lang/cn/nmNum_cn.qm b/Bin/Config/Lang/cn/nmNum_cn.qm
index a0b706a0..3cf81428 100644
Binary files a/Bin/Config/Lang/cn/nmNum_cn.qm and b/Bin/Config/Lang/cn/nmNum_cn.qm differ
diff --git a/Bin/Config/Lang/cn/nmNum_cn.ts b/Bin/Config/Lang/cn/nmNum_cn.ts
index 623ec74d..6759fa7a 100644
--- a/Bin/Config/Lang/cn/nmNum_cn.ts
+++ b/Bin/Config/Lang/cn/nmNum_cn.ts
@@ -1113,8 +1113,8 @@ Reason: %1</source>
         <translation>目标井名称为空</translation>
     </message>
     <message>
-        <source>LM stage 1: align curve height using permeability only (up to %1 evaluations).</source>
-        <translation>LM 阶段一：仅调整渗透率对齐曲线高度（最多求解 %1 次）。</translation>
+        <source>LM stage 1: align curve height using permeability only; no fixed evaluation limit, effective improvement threshold 10%.</source>
+        <translation>LM 阶段一：仅调整渗透率对齐曲线高度，不限制试算次数，有效改善门槛为 10%。</translation>
     </message>
     <message>
         <source>Permeability alignment: k=%1, height error=%2, shape error=%3, result=%4</source>
@@ -1141,8 +1141,8 @@ Reason: %1</source>
         <translation>渗透率高度对齐结束：%1</translation>
     </message>
     <message>
-        <source>height evaluation budget reached</source>
-        <translation>达到高度调整求解预算</translation>
+        <source>no feasible permeability step or step too small</source>
+        <translation>无可行的渗透率调整步或步长过小</translation>
     </message>
     <message>
         <source>stopped by user</source>
diff --git a/Src/nmNum/nmCalculation/nmCalculationAutoFitLM.cpp b/Src/nmNum/nmCalculation/nmCalculationAutoFitLM.cpp
index 55d8c7a6..e3f6579b 100644
--- a/Src/nmNum/nmCalculation/nmCalculationAutoFitLM.cpp
+++ b/Src/nmNum/nmCalculation/nmCalculationAutoFitLM.cpp
@@ -2087,15 +2087,14 @@ StopReasonLM nmCalculationAutoFitLM::runTrustRegionFitting()
     // 高度预调整只改变用户勾选的渗透率。ln(k) 的初始变化由有符号高度差
     // 给出，真实求解后用割线估计修正；拒绝时缩步，不让其他参数补偿高度。
     const int permeabilityColumn = m_enabledParamIndices.indexOf(0);
-    const int heightBudget = qMin(4, qMax(0, (maximumEvaluations - m_totalEvaluations - dimensions - 2) / 6));
     double heightBaseline = current.breakdown.verticalLoss;
     int heightStagnation = 0;
     double heightScale = 1.0;
     double heightSlope = -1.0;
     if(permeabilityColumn >= 0) {
-        emit logMessageGenerated(tr("LM stage 1: align curve height using permeability only (up to %1 evaluations).")
-                                 .arg(heightBudget));
-        for(int trial = 0; trial < heightBudget && processPauseAndStop(); ++trial) {
+        emit logMessageGenerated(tr("LM stage 1: align curve height using permeability only; no fixed evaluation limit, effective improvement threshold 10%."));
+        // 不限制试算次数，由高度对齐、改善停滞及可行步长决定何时结束。
+        while(processPauseAndStop()) {
             const double bias = current.breakdown.verticalCommonBias;
             if(!current.breakdown.verticalReliable || qAbs(bias) <= 0.01 || heightStagnation >= 2) break;
             const double k = current.parameters[permeabilityColumn];
@@ -2127,7 +2126,7 @@ StopReasonLM nmCalculationAutoFitLM::runTrustRegionFitting()
                 heightScale *= 0.5;
             }
             restoreEvaluationState(current);
-            if(heightBaseline - current.breakdown.verticalLoss >= qMax(1.0e-4, 0.01 * heightBaseline)) {
+            if(heightBaseline - current.breakdown.verticalLoss >= qMax(1.0e-4, 0.10 * heightBaseline)) {
                 heightBaseline = current.breakdown.verticalLoss;
                 heightStagnation = 0;
             } else ++heightStagnation;
@@ -2136,7 +2135,7 @@ StopReasonLM nmCalculationAutoFitLM::runTrustRegionFitting()
                 .arg(candidate.breakdown.verticalLoss, 0, 'e', 4).arg(candidate.breakdown.shapeLoss, 0, 'e', 4)
                 .arg(accepted ? tr("accepted") : tr("rejected")));
         }
-        QString heightReason = tr("height evaluation budget reached");
+        QString heightReason = tr("no feasible permeability step or step too small");
         if(m_shouldStop) heightReason = tr("stopped by user");
         else if(!current.breakdown.verticalReliable) heightReason = tr("pressure and derivative height directions conflict");
         else if(current.breakdown.verticalLoss <= 0.01) heightReason = tr("curve height is approximately aligned");