diff --git a/pages/purchase/create/index.js b/pages/purchase/create/index.js
index c7e9ce2..d80a979 100644
--- a/pages/purchase/create/index.js
+++ b/pages/purchase/create/index.js
@@ -203,7 +203,7 @@ Page({
     if(!util.isEmpty(this.data.form.unitPrice) && !this.data.kg){
       this.data.form.unitPrice = math.divide(this.data.form.unitPrice, 1000)
     }
-    if(!util.isEmpty(this.data.form.unitPrice) && !this.data.kg){
+    if(!util.isEmpty(this.data.form.purchaseQuantity) && !this.data.kg){
       this.data.form.purchaseQuantity = math.times(this.data.form.purchaseQuantity, 1000)
     }
     this.setData({  requesting: true })