diff --git a/api/server.go b/api/server.go
index a2ab1250..21893242 100644
--- a/api/server.go
+++ b/api/server.go
@@ -345,8 +345,8 @@ func (s *Server) handleCreateTrader(c *gin.Context) {
 
 	// 设置扫描间隔默认值
 	scanIntervalMinutes := req.ScanIntervalMinutes
-	if scanIntervalMinutes <= 0 {
-		scanIntervalMinutes = 3 // 默认3分钟
+	if scanIntervalMinutes < 3 {
+		scanIntervalMinutes = 3 // 默认3分钟，且不允许小于3
 	}
 
 	// ✨ 查询交易所实际余额，覆盖用户输入
@@ -527,6 +527,8 @@ func (s *Server) handleUpdateTrader(c *gin.Context) {
 	scanIntervalMinutes := req.ScanIntervalMinutes
 	if scanIntervalMinutes <= 0 {
 		scanIntervalMinutes = existingTrader.ScanIntervalMinutes // 保持原值
+	} else if scanIntervalMinutes < 3 {
+		scanIntervalMinutes = 3
 	}
 
 	// 更新交易员配置
diff --git a/web/package-lock.json b/web/package-lock.json
index 5e41f91e..a117b2cb 100644
--- a/web/package-lock.json
+++ b/web/package-lock.json
@@ -7177,7 +7177,6 @@
       "integrity": "sha512-lcYcMxX2PO9XMGvAJkJ3OsNMw+/7FKes7/hgerGUYWIoWu5j/+YQqcZr5JnPZWzOsEBgMbSbiSTn/dv/69Mkpw==",
       "dev": true,
       "license": "ISC",
-      "peer": true,
       "bin": {
         "yaml": "bin.mjs"
       },
diff --git a/web/src/components/TraderConfigModal.tsx b/web/src/components/TraderConfigModal.tsx
index e0c7c0bf..95a49473 100644
--- a/web/src/components/TraderConfigModal.tsx
+++ b/web/src/components/TraderConfigModal.tsx
@@ -442,14 +442,15 @@ export function TraderConfigModal({
                   <input
                     type="number"
                     value={formData.scan_interval_minutes}
-                    onChange={(e) =>
-                      handleInputChange(
-                        'scan_interval_minutes',
-                        Number(e.target.value)
-                      )
-                    }
+                    onChange={(e) => {
+                      const parsedValue = Number(e.target.value)
+                      const safeValue = Number.isFinite(parsedValue)
+                        ? Math.max(3, parsedValue)
+                        : 3
+                      handleInputChange('scan_interval_minutes', safeValue)
+                    }}
                     className="w-full px-3 py-2 bg-[#0B0E11] border border-[#2B3139] rounded text-[#EAECEF] focus:border-[#F0B90B] focus:outline-none"
-                    min="1"
+                    min="3"
                     max="60"
                     step="1"
                   />