diff --git a/Src/nmNum/nmCalculation/nmCalculationDllPebiSolverTask.cpp b/Src/nmNum/nmCalculation/nmCalculationDllPebiSolverTask.cpp
index 78c584b..6ce6b41 100644
--- a/Src/nmNum/nmCalculation/nmCalculationDllPebiSolverTask.cpp
+++ b/Src/nmNum/nmCalculation/nmCalculationDllPebiSolverTask.cpp
@@ -286,11 +286,10 @@ bool applyPropertyInterpolation(
 }
 
 /**
- * @brief 用网格输出和捕获的场景值组装一次完整模型输入。
+ * @brief 用已初始化的模型输入和捕获的场景值组装一次完整模型输入。
  */
 bool buildModelInputFromSnapshot(
         const nmPebiSolverInputSnapshot& oSnapshot,
-        const HX_NWTM_GRID_OUTPUT2& oGridOutput,
         HX_NWTM_MODEL_INPUT& oModelInput,
         QString& sErrorMessage,
         const QAtomicInt* pCancelRequested)
@@ -300,10 +299,6 @@ bool buildModelInputFromSnapshot(
     if(isTaskCancellationRequested(pCancelRequested)) {
         return false;
     }
-    oModelInput = HX_NWTM_MODEL_INPUT(oGridOutput);
-    if(isTaskCancellationRequested(pCancelRequested)) {
-        return false;
-    }
 
     // 第一步：恢复井槽位、产量制度和井筒参数。场景与网格快照在同一次捕获中
     // 生成，因此这些外层数组天然使用同一个 DLL 下标顺序。
@@ -356,7 +351,7 @@ bool buildModelInputFromSnapshot(
     oModelInput.Base.dt_Min = oScene.Base.dt_Min;
     oModelInput.Base.dt_Max = oScene.Base.dt_Max;
 
-    const size_t nCellCount = oGridOutput.Trinodexy.size();
+    const size_t nCellCount = oModelInput.GRID.Trinodexy.size();
     oModelInput.Base.k = dVec1(nCellCount, oScene.Base.k_ref);
     oModelInput.Base.phi = dVec1(nCellCount, oScene.Base.phi_ref);
     oModelInput.Base.h = dVec1(nCellCount, oScene.Base.h_ref);
@@ -854,21 +849,16 @@ bool nmCalculationDllPebiSolverTask::prepareManualInput()
 
     reportStage(tr("Checking grid cache..."), 0, 0);
     if(m_pInputSnapshot->m_bMayUseCachedGrid) {
-        HX_NWTM_GRID_OUTPUT1 oGridOutput1;
-        HX_NWTM_GRID_OUTPUT2 oGridOutput2;
-        int nPebiCount = -1;
+        nmPebiGridResult& oGridResult =
+                m_pInputSnapshot->m_oGridResult;
+        // 缓存直接复制到任务快照，避免大网格在局部对象中产生额外副本。
         if(pGridService->copyCurrentGridFor(
                m_pDataManager,
                m_nGridInputRevision,
-               oGridOutput1,
-               oGridOutput2,
-               nPebiCount,
+               oGridResult.m_oGridOutput1,
+               oGridResult.m_oGridOutput2,
+               oGridResult.m_nPebiCount,
                &m_nCancelRequested)) {
-            nmPebiGridResult& oGridResult =
-                    m_pInputSnapshot->m_oGridResult;
-            oGridResult.m_oGridOutput1 = oGridOutput1;
-            oGridResult.m_oGridOutput2 = oGridOutput2;
-            oGridResult.m_nPebiCount = nPebiCount;
             oGridResult.m_bSucceeded = true;
 
             reportStage(tr("Preparing result grid..."), 0, 0);
@@ -1002,11 +992,11 @@ bool nmCalculationDllPebiSolverTask::execPebiMode()
 
     // 第三步：由场景值快照重建完整模型输入。属性插值可以耗时，但它只读取任务
     // 自己的点集副本，因此放在工作线程不会阻塞或竞争界面数据。
-    HX_NWTM_MODEL_INPUT oModelInput;
+    // 直接初始化可避免先构造临时模型输入、再复制完整 GRID 的额外内存峰值。
+    HX_NWTM_MODEL_INPUT oModelInput(oGridResult.m_oGridOutput2);
     QString sInterpolationError;
     reportStage(tr("Preparing model input..."), 0, 0);
     if(!buildModelInputFromSnapshot(*m_pInputSnapshot,
-                                    oGridResult.m_oGridOutput2,
                                     oModelInput,
                                     sInterpolationError,
                                     pCancelRequested)) {