diff --git a/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_painter.dart b/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_painter.dart
index 6858d1ea..ed89f0af 100644
--- a/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_painter.dart
+++ b/frontend/mining-app/lib/presentation/widgets/kline_chart/kline_painter.dart
@@ -179,7 +179,9 @@ class KlinePainter extends CustomPainter {
       // 绘制实体
       final bodyTop = math.min(yOpen, yClose);
       final bodyBottom = math.max(yOpen, yClose);
-      final actualBodyBottom = bodyBottom - bodyTop < 1 ? bodyTop + 1 : bodyBottom;
+      // 最小实体高度：至少为蜡烛宽度的40%或3像素，避免 open≈close 时显示为横线"-"
+      final minBodyHeight = math.max(bodyWidth * 0.4, 3.0);
+      final actualBodyBottom = bodyBottom - bodyTop < minBodyHeight ? bodyTop + minBodyHeight : bodyBottom;
 
       if (isUp) {
         // 阳线：空心或实心