diff --git a/src/hooks/usePurchaseRules.ts b/src/hooks/usePurchaseRules.ts
index f0daa11..72879dc 100644
--- a/src/hooks/usePurchaseRules.ts
+++ b/src/hooks/usePurchaseRules.ts
@@ -74,13 +74,22 @@ export function usePurchaseRules() {
 
     const getRuleAmount = (code: string, defaultVal?: number) => {
       const rule = rules.value.find(r => r.ruleCode === code);
-      if (!rule || rule.amountMin === undefined || rule.amountMin === null) {
+      if (!rule) {
         if (defaultVal === undefined) {
           throw new Error(`采购规则配置缺失: ${code}，请在系统配置中维护`);
         }
         return defaultVal;
       }
-      return Number(rule.amountMin);
+      if (rule.amountMin !== undefined && rule.amountMin !== null) {
+        return Number(rule.amountMin);
+      }
+      if (rule.amountMax !== undefined && rule.amountMax !== null) {
+        return Number(rule.amountMax);
+      }
+      if (defaultVal === undefined) {
+        throw new Error(`采购规则配置缺失: ${code}，请在系统配置中维护`);
+      }
+      return defaultVal;
     };
 
     thresholds.deptPurchase = getRuleAmount('DEPT_PURCHASE_THRESHOLD');