diff --git a/frameworks/bridge/cj_frontend/interfaces/cj_ffi/cj_pixel_unit_convert_ffi.cpp b/frameworks/bridge/cj_frontend/interfaces/cj_ffi/cj_pixel_unit_convert_ffi.cpp
index f3f6cedd8dce732f0b733d1a25504b6c142c22ae..9d19e62cc6c668f95d82cbb59db10928a505a7be 100644
--- a/frameworks/bridge/cj_frontend/interfaces/cj_ffi/cj_pixel_unit_convert_ffi.cpp
+++ b/frameworks/bridge/cj_frontend/interfaces/cj_ffi/cj_pixel_unit_convert_ffi.cpp
@@ -88,6 +88,14 @@ double GetdesignWidthScale()
         return NAN;
     }
     auto windowConfig = frontend->GetWindowConfig();
+    
+    // 在强制分屏模式下调整计算宽度
+    if (pipelineContext && pipelineContext->IsInForceSplitMode()) {
+        double effectiveWidth = pipelineContext->GetForceSplitEffectiveWidth(width);
+        if (effectiveWidth > 0) {
+            width = effectiveWidth;
+        }
+    }
 
     windowConfig.UpdateDesignWidthScale(width);
     return windowConfig.GetDesignWidthScale(width);
diff --git a/frameworks/bridge/declarative_frontend/engine/jsi/jsi_view_register.cpp b/frameworks/bridge/declarative_frontend/engine/jsi/jsi_view_register.cpp
index da3a96845571724171e4459401a5d671a11c5fa7..8b61c9ccb795ecf7f208af561698170526cbcad5 100644
--- a/frameworks/bridge/declarative_frontend/engine/jsi/jsi_view_register.cpp
+++ b/frameworks/bridge/declarative_frontend/engine/jsi/jsi_view_register.cpp
@@ -1124,6 +1124,15 @@ panda::Local<panda::JSValueRef> Lpx2Px(panda::JsiRuntimeCallInfo* runtimeCallInf
     if (pipelineContext && pipelineContext->IsContainerModalVisible()) {
         width -= 2 * (CONTAINER_BORDER_WIDTH + CONTENT_PADDING).ConvertToPx();
     }
+
+    // 在强制分屏模式下调整计算宽度
+    if (pipelineContext && pipelineContext->IsInForceSplitMode()) {
+        double effectiveWidth = pipelineContext->GetForceSplitEffectiveWidth(width);
+        if (effectiveWidth > 0) {
+            width = effectiveWidth;
+        }
+    }
+
     if (!windowConfig.autoDesignWidth) {
         windowConfig.UpdateDesignWidthScale(width);
     }
@@ -1158,6 +1167,15 @@ panda::Local<panda::JSValueRef> Px2Lpx(panda::JsiRuntimeCallInfo* runtimeCallInf
     if (pipelineContext && pipelineContext->IsContainerModalVisible()) {
         width -= 2 * (CONTAINER_BORDER_WIDTH + CONTENT_PADDING).ConvertToPx();
     }
+
+    // 在强制分屏模式下调整计算宽度
+    if (pipelineContext && pipelineContext->IsInForceSplitMode()) {
+        double effectiveWidth = pipelineContext->GetForceSplitEffectiveWidth(width);
+        if (effectiveWidth > 0) {
+            width = effectiveWidth;
+        }
+    }
+
     if (!windowConfig.autoDesignWidth) {
         windowConfig.UpdateDesignWidthScale(width);
     }
diff --git a/frameworks/core/components_ng/pattern/navigation/navigation_pattern.cpp b/frameworks/core/components_ng/pattern/navigation/navigation_pattern.cpp
index c53f19701b8d4e49fdb2e9a9efe41c8b652abcb8..4a604118428aefa35917db2463d4613aedca0c34 100644
--- a/frameworks/core/components_ng/pattern/navigation/navigation_pattern.cpp
+++ b/frameworks/core/components_ng/pattern/navigation/navigation_pattern.cpp
@@ -5195,6 +5195,7 @@ void NavigationPattern::TryForceSplitIfNeeded(const SizeF& frameSize)
     }
     forceSplitSuccess_ = forceSplitSuccess;
     forceSplitUseNavBar_ = forceSplitUseNavBar;
+    context->SetIsInForceSplitMode(forceSplitSuccess_);
     SwapNavDestinationAndPlaceHolder(true);
 }
 
diff --git a/frameworks/core/interfaces/native/implementation/global_scope_accessor.cpp b/frameworks/core/interfaces/native/implementation/global_scope_accessor.cpp
index 2a95c43101e78b0c31ba42616e4f49422123166e..687ad7b8e12d6389fe6d424a6833c6af96111866 100644
--- a/frameworks/core/interfaces/native/implementation/global_scope_accessor.cpp
+++ b/frameworks/core/interfaces/native/implementation/global_scope_accessor.cpp
@@ -130,6 +130,15 @@ Ark_Number Lpx2pxImpl(const Ark_Number* value)
         int32_t multiplier = 2;
         width -= multiplier * (CONTAINER_BORDER_WIDTH + CONTENT_PADDING).ConvertToPx();
     }
+    
+    // 在强制分屏模式下调整计算宽度
+    if (pipelineContext && pipelineContext->IsInForceSplitMode()) {
+        double effectiveWidth = pipelineContext->GetForceSplitEffectiveWidth(width);
+        if (effectiveWidth > 0) {
+            width = effectiveWidth;
+        }
+    }
+    
     if (!windowConfig.autoDesignWidth) {
         windowConfig.UpdateDesignWidthScale(width);
     }
@@ -161,6 +170,15 @@ Ark_Number Px2lpxImpl(const Ark_Number* value)
         int32_t multiplier = 2;
         width -= multiplier * (CONTAINER_BORDER_WIDTH + CONTENT_PADDING).ConvertToPx();
     }
+    
+    // 在强制分屏模式下调整计算宽度
+    if (pipelineContext && pipelineContext->IsInForceSplitMode()) {
+        double effectiveWidth = pipelineContext->GetForceSplitEffectiveWidth(width);
+        if (effectiveWidth > 0) {
+            width = effectiveWidth;
+        }
+    }
+    
     if (!windowConfig.autoDesignWidth) {
         windowConfig.UpdateDesignWidthScale(width);
     }
diff --git a/frameworks/core/pipeline/pipeline_base.cpp b/frameworks/core/pipeline/pipeline_base.cpp
index d8c4f548f47920be258ead58317667ff1d23f333..2c072f6edffd2cc31902f148baed6c3469206f44 100644
--- a/frameworks/core/pipeline/pipeline_base.cpp
+++ b/frameworks/core/pipeline/pipeline_base.cpp
@@ -512,6 +512,15 @@ void PipelineBase::UpdateRootSizeAndScale(int32_t width, int32_t height)
         if (IsContainerModalVisible()) {
             pageWidth -= 2 * (CONTAINER_BORDER_WIDTH + CONTENT_PADDING).ConvertToPx();
         }
+
+        if (IsInForceSplitMode()) {
+            // 获取Navigation的有效内容宽度
+            double effectiveContentWidth = GetForceSplitEffectiveWidth(pageWidth);
+            if (effectiveContentWidth > 0) {
+                pageWidth = effectiveContentWidth;
+            }
+        }
+
         designWidthScale_ =
             windowConfig.autoDesignWidth ? density_ : pageWidth / windowConfig.designWidth;
         windowConfig.designWidthScale = designWidthScale_;
@@ -1141,4 +1150,10 @@ void PipelineBase::SetUiDVSyncCommandTime(uint64_t vsyncTime)
     commandTimeUpdate_ = true;
     dvsyncTimeUpdate_ = true;
 }
+
+double PipelineBase::GetForceSplitEffectiveWidth(double totalWidth) const
+{
+    // 默认实现：返回原始宽度，子类可以重写
+    return totalWidth;
+}
 } // namespace OHOS::Ace
diff --git a/frameworks/core/pipeline/pipeline_base.h b/frameworks/core/pipeline/pipeline_base.h
index a7cc02d5d3f73812d01a1afc0bc93f342816f67c..1eac3c6dcee96476ea2e646d6d325268d5902b49 100644
--- a/frameworks/core/pipeline/pipeline_base.h
+++ b/frameworks/core/pipeline/pipeline_base.h
@@ -887,6 +887,19 @@ public:
         return viewScale_;
     }
 
+    void SetIsInForceSplitMode(bool isInForceSplitMode)
+    {
+        IsInForceSplitMode_ = isInForceSplitMode;
+    }
+
+    bool IsInForceSplitMode() const
+    {
+        return IsInForceSplitMode_;
+    }
+
+    // 获取强制分屏模式下的有效内容宽度，用于LPX计算
+    virtual double GetForceSplitEffectiveWidth(double totalWidth) const;
+
     double GetRootWidth() const
     {
         return rootWidth_;
@@ -1674,6 +1687,7 @@ protected:
     float viewScale_ = 1.0f;
     double density_ = 1.0;
     double dipScale_ = 1.0;
+    bool IsInForceSplitMode_ = false;
     double rootHeight_ = 0.0;
     double rootWidth_ = 0.0;
     int32_t width_ = 0;
diff --git a/frameworks/core/pipeline_ng/pipeline_context.cpp b/frameworks/core/pipeline_ng/pipeline_context.cpp
index 0db0cc10ddae8c275f23412b5ea211143a3c6880..f84f92a0529cd0d6e2066703613066aa1d597e6f 100755
--- a/frameworks/core/pipeline_ng/pipeline_context.cpp
+++ b/frameworks/core/pipeline_ng/pipeline_context.cpp
@@ -31,6 +31,7 @@
 #include "base/geometry/ng/offset_t.h"
 #include "base/geometry/ng/rect_t.h"
 #include "base/log/ace_performance_monitor.h"
+#include "core/components_ng/pattern/navigation/navigation_declaration.h"
 #include "base/log/ace_trace.h"
 #include "base/log/ace_tracker.h"
 #include "base/log/dump_log.h"
@@ -6569,4 +6570,18 @@ void PipelineContext::OnDumpBindAICaller(const std::vector<std::string>& params)
     }
 }
 
+double PipelineContext::GetForceSplitEffectiveWidth(double totalWidth) const
+{
+    // 强制分屏模式下，按照去掉中间分割线后除以2计算
+    // 使用Navigation组件定义的标准分割线宽度
+    double dividerWidth = DIVIDER_WIDTH.ConvertToPx(); // 使用标准分割线宽度
+    double effectiveContentWidth = (totalWidth - dividerWidth) / 2.0;
+    
+    TAG_LOGI(AceLogTag::ACE_NAVIGATION, 
+        "Force split mode: adjust lpx calculation from total width %{public}f to half width %{public}f (divider: %{public}f)", 
+        totalWidth, effectiveContentWidth, dividerWidth);
+
+    return effectiveContentWidth > 0 ? effectiveContentWidth : totalWidth;
+}
+
 } // namespace OHOS::Ace::NG
diff --git a/frameworks/core/pipeline_ng/pipeline_context.h b/frameworks/core/pipeline_ng/pipeline_context.h
index 20325bfbbd3f192afe3199032b51e420b63d5ffc..eeffd509f3b6d93ec420d03e4fbe76111b991752 100755
--- a/frameworks/core/pipeline_ng/pipeline_context.h
+++ b/frameworks/core/pipeline_ng/pipeline_context.h
@@ -948,6 +948,9 @@ public:
         return memoryMgr_;
     }
 
+    // 重写强制分屏模式下的有效内容宽度计算
+    double GetForceSplitEffectiveWidth(double totalWidth) const override;
+
     const RefPtr<NavigationManager>& GetNavigationManager() const
     {
         return navigationMgr_;