diff --git a/src/main/java/org/jetlinks/core/metadata/types/NumberType.java b/src/main/java/org/jetlinks/core/metadata/types/NumberType.java
index a2be3153..b1e906aa 100644
--- a/src/main/java/org/jetlinks/core/metadata/types/NumberType.java
+++ b/src/main/java/org/jetlinks/core/metadata/types/NumberType.java
@@ -68,7 +68,7 @@ public Object format(Object value) {
             return null;
         }
         Number val = convertScaleNumber(value,
-                                        this.getScale(),
+                                        this.getScale(defaultScale()),
                                         getRound(),
                                         Function.identity());
         if (val == null) {