diff --git a/demo/build.gradle b/demo/build.gradle
index 1f324f6..0701188 100644
--- a/demo/build.gradle
+++ b/demo/build.gradle
@@ -17,6 +17,7 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
+    buildToolsVersion '26.0.2'
 }
 
 dependencies {
@@ -30,5 +31,4 @@ dependencies {
     implementation project(':leftsection')
     implementation 'com.github.bumptech.glide:glide:4.6.1'
     annotationProcessor 'com.github.bumptech.glide:compiler:4.6.1'
-
 }
diff --git a/demo/src/main/java/estar/leftsectionrecyclerview/TestActivity.java b/demo/src/main/java/estar/leftsectionrecyclerview/TestActivity.java
index 8866b02..11d4c7c 100644
--- a/demo/src/main/java/estar/leftsectionrecyclerview/TestActivity.java
+++ b/demo/src/main/java/estar/leftsectionrecyclerview/TestActivity.java
@@ -32,6 +32,9 @@ protected void onCreate(Bundle savedInstanceState) {
 
         List<ImageInfo> list = new ArrayList<>();
         list.add(new ImageInfo(true, "图组1"));
+        list.add(new ImageInfo(false, "图组1"));
+        list.add(new ImageInfo(false, "图组1"));
+
         list.add(new ImageInfo(true, "图组2"));
         list.add(new ImageInfo(false, "图组1"));
         list.add(new ImageInfo(false, "图组1"));
diff --git a/leftsection/src/main/java/estar/leftsection/SectionItemDecoration.java b/leftsection/src/main/java/estar/leftsection/SectionItemDecoration.java
index c3b11ea..db9dd8c 100644
--- a/leftsection/src/main/java/estar/leftsection/SectionItemDecoration.java
+++ b/leftsection/src/main/java/estar/leftsection/SectionItemDecoration.java
@@ -180,15 +180,17 @@ public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
             if (isC) {
                 for (int i1 = position + 1; i1 < adapter.getItemCount(); i1++) {
                     if (adapter.getItem(i1).isSection()) {
-                        int index = i1 - firstVisibleItem - 1;
-                        if (index < 0) {
-                            index = 0;
-                        }
-                        if (index <= lastVisibleItem) {
-                            bottom = parent.getChildAt(index).getBottom() + dex4S;
+
+                        View view = parent.getLayoutManager().findViewByPosition(i1 - 1);
+                        if (view != null) {
+                            bottom = view.getBottom() + dex4S;
                         }
-                        if (bottom < top&&bottom!=0) {
-                            bottom = parent.getChildAt(index + 1).getBottom() + dex4S;
+
+                        if (bottom < top && bottom != 0) {
+                            view = parent.getLayoutManager().findViewByPosition(i1);
+                            if (view != null) {
+                                bottom = view.getBottom() + dex4S;
+                            }
                         }
 
                         break;
@@ -205,7 +207,6 @@ public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
 
                 Rect rect = new Rect(left, top, right, bottom);
 
-
                 RectF rectF = new RectF(rect);
                 c.drawRect(rectF, paint);
 
@@ -250,7 +251,7 @@ public void getItemOffsets(Rect outRect, View view, RecyclerView parent, Recycle
         int top = 0;
         int left = 0;
         int right = 0;
-        if (position > 0 && adapter.getItem(position - index).isSection()) {
+        if (adapter.getItem(position - index).isSection()) {
             top = (int) this.decTopMargin;
         }