diff --git a/src/back-top/back-top.less b/src/back-top/back-top.less
index bdafba7c7..07440fbde 100644
--- a/src/back-top/back-top.less
+++ b/src/back-top/back-top.less
@@ -8,8 +8,9 @@
 @back-top-half-round-width: 120rpx;
 @back-top-half-round-height: 80rpx;
 @back-top-fixed-right: @spacer;
-@back-top-fixed-bottom: @spacer-2;
-
+@safe-area-inset-bottom: constant(safe-area-inset-bottom);
+@safe-area-inset-bottom: env(safe-area-inset-bottom);
+@back-top-fixed-bottom: calc(@spacer-2 + @safe-area-inset-bottom);
 @back-top-round-color: var(--td-back-top-round-color, @font-gray-1);
 @back-top-round-bg-color: var(--td-back-top-round-bg-color, @font-white-1);
 @back-top-round-border-color: var(--td-back-top-round-border-color, @component-border);