diff --git a/app/src/main/java/com/inspection/camera/data/models/WatermarkModels.kt b/app/src/main/java/com/inspection/camera/data/models/WatermarkModels.kt
index 1b3cb83..8aefb0d 100644
--- a/app/src/main/java/com/inspection/camera/data/models/WatermarkModels.kt
+++ b/app/src/main/java/com/inspection/camera/data/models/WatermarkModels.kt
@@ -51,10 +51,10 @@ enum class LocationMode {
 /**
  * 图片质量
  */
-enum class ImageQuality(val quality: Int, val displayName: String) {
-    High(100, "高清"),
-    Standard(85, "标准"),
-    Low(70, "流畅")
+enum class ImageQuality(val quality: Int, val displayName: String, val scaleFactor: Float) {
+    High(100, "高清", 0.8f),
+    Standard(85, "标准", 0.5f),
+    Low(70, "流畅", 0.3f)
 }
 
 /**
diff --git a/app/src/main/java/com/inspection/camera/ui/merge/MergeScreen.kt b/app/src/main/java/com/inspection/camera/ui/merge/MergeScreen.kt
index 7cdb9b2..e0cff9d 100644
--- a/app/src/main/java/com/inspection/camera/ui/merge/MergeScreen.kt
+++ b/app/src/main/java/com/inspection/camera/ui/merge/MergeScreen.kt
@@ -520,7 +520,7 @@ fun MergeScreen(
                                     context,
                                     imageItems,
                                     layoutType,
-                                    imageQuality,
+                                    ImageQuality.High,
                                     title,
                                     content,
                                     titleStyle,
diff --git a/app/src/main/java/com/inspection/camera/util/ImageProcessor.kt b/app/src/main/java/com/inspection/camera/util/ImageProcessor.kt
index 66586ec..4987063 100644
--- a/app/src/main/java/com/inspection/camera/util/ImageProcessor.kt
+++ b/app/src/main/java/com/inspection/camera/util/ImageProcessor.kt
@@ -231,10 +231,28 @@ object ImageProcessor {
         val cols = layoutType.cols
         val rows = layoutType.rows
 
-        val outputWidth = 1920
-        val cellSpacing = 16  // 单元格间距 16px (约 4dp * 4)
-        val cellWidth = (outputWidth - cellSpacing * (cols + 1)) / cols
-        val cellHeight = cellWidth  // 保持正方形格子
+        val cellSpacing = 16
+        val maxCellDimension = 800
+
+        // 根据第一张图片的原始尺寸确定单元格宽高比
+        val firstBitmap = images.firstOrNull()?.let { tryLoadBitmap(context, it) }
+        val (srcW, srcH) = if (firstBitmap != null) {
+            Pair(firstBitmap.width, firstBitmap.height).also { firstBitmap.recycle() }
+        } else {
+            Pair(1, 1)
+        }
+
+        // 基准单元格大小（限制不超过maxCellDimension）
+        val longer = maxOf(srcW, srcH)
+        val baseScale = if (longer > maxCellDimension) maxCellDimension.toFloat() / longer else 1.0f
+        val baseCellWidth = (srcW * baseScale).toInt()
+        val baseCellHeight = (srcH * baseScale).toInt()
+
+        // 根据质量等级缩放
+        val cellWidth = (baseCellWidth * quality.scaleFactor).toInt().coerceAtLeast(1)
+        val cellHeight = (baseCellHeight * quality.scaleFactor).toInt().coerceAtLeast(1)
+
+        val outputWidth = (cellWidth * cols + cellSpacing * (cols + 1)).coerceAtLeast(480)
 
         // 底部文字区域高度 - 动态计算
         val textAreaHeight = if (bottomTitle.isNotBlank() || bottomContent.isNotBlank()) {