diff --git a/frameworks/core/components_ng/pattern/waterflow/layout/top_down/water_flow_segmented_layout.cpp b/frameworks/core/components_ng/pattern/waterflow/layout/top_down/water_flow_segmented_layout.cpp
index b9ea609305b62988f7c89f8ac16ef41a40859363..92eeb005717c292afb5097a12dc2888b058bb69e 100644
--- a/frameworks/core/components_ng/pattern/waterflow/layout/top_down/water_flow_segmented_layout.cpp
+++ b/frameworks/core/components_ng/pattern/waterflow/layout/top_down/water_flow_segmented_layout.cpp
@@ -59,6 +59,7 @@ void WaterFlowSegmentedLayout::Measure(LayoutWrapper* wrapper)
     sections_ = pattern->GetSections();
     if (sections_ && !IsSectionValid(info_, info_->childrenCount_)) {
         info_->isDataValid_ = false;
+        WaterFlowLayoutUtils::PreMeasureSelf(wrapper_, axis_);
         return;
     }
 
diff --git a/test/unittest/core/pattern/waterflow/water_flow_segment_layout_test.cpp b/test/unittest/core/pattern/waterflow/water_flow_segment_layout_test.cpp
index 1a6632ff69dfe1a2e1cfaffbe9b9fa1c778dd660..cba977dad4188d0bfc83a4089a9d49ed8b843f79 100644
--- a/test/unittest/core/pattern/waterflow/water_flow_segment_layout_test.cpp
+++ b/test/unittest/core/pattern/waterflow/water_flow_segment_layout_test.cpp
@@ -2128,4 +2128,46 @@ HWTEST_F(WaterFlowSegmentTest, WaterFlowRTLPaddingWithSections003, TestSize.Leve
     EXPECT_LE(multiColumnItem.Right(), WATER_FLOW_WIDTH - 30.0f + 1.0f);
     EXPECT_GE(multiColumnItem.Left(), 10.0f - 1.0f);
 }
+
+/**
+ * @tc.name: InvalidSectionWithDefaultSize
+ * @tc.desc: Verify WaterFlow maintains default size when both children count and segment tails are invalid
+ * @tc.type: FUNC
+ */
+HWTEST_F(WaterFlowSegmentTest, InvalidSectionWithDefaultSize, TestSize.Level1)
+{
+    // Initialize WaterFlow with default size
+    CreateWaterFlow();
+    ViewAbstract::SetWidth(CalcLength(400.0f));
+    ViewAbstract::SetHeight(CalcLength(800.0f));
+
+    CreateWaterFlowItems(5);
+    auto secObj = pattern_->GetOrCreateWaterFlowSections();
+    secObj->ChangeData(0, 0, SECTION_13);
+    CreateDone();
+
+    // Verify initial indices
+    auto info = AceType::DynamicCast<WaterFlowLayoutInfo>(pattern_->layoutInfo_);
+    EXPECT_EQ(info->startIndex_, 0);
+    EXPECT_EQ(info->endIndex_, 4);
+
+    // Create mismatch by removing children
+    for (int i = 3; i <= 4; ++i) {
+        frameNode_->RemoveChildAtIndex(3);
+    }
+    frameNode_->ChildrenUpdatedFrom(3);
+
+    // Ensure mismatch by modifying segment tails
+    if (!info->segmentTails_.empty()) {
+        info->segmentTails_.back() = 10;
+    }
+
+    frameNode_->MarkDirtyNode(PROPERTY_UPDATE_MEASURE);
+    FlushUITasks();
+
+    // WaterFlow should maintain default size
+    auto geometryNode = frameNode_->GetGeometryNode();
+    EXPECT_EQ(geometryNode->GetFrameSize().Width(), 400.0f);
+    EXPECT_EQ(geometryNode->GetFrameSize().Height(), 800.0f);
+}
 } // namespace OHOS::Ace::NG
\ No newline at end of file