diff --git a/internal/controllers/settings_controller.go b/internal/controllers/settings_controller.go
index 7f6c680..99ce07b 100644
--- a/internal/controllers/settings_controller.go
+++ b/internal/controllers/settings_controller.go
@@ -293,6 +293,24 @@ func (sc *SettingsController) UpdateSchedulerSettings(c *gin.Context) {
 		return
 	}
 
+	var workerCount int
+	if _, err := fmt.Sscanf(req.WorkerCount, "%d", &workerCount); err != nil || workerCount < 1 || workerCount > 1000 {
+		utils.BadRequest(c, "工作线程数必须在 1 至 1000 之间")
+		return
+	}
+
+	var queueSize int
+	if _, err := fmt.Sscanf(req.QueueSize, "%d", &queueSize); err != nil || queueSize < 1 || queueSize > 50000 {
+		utils.BadRequest(c, "等待队列容量必须在 1 至 50000 之间")
+		return
+	}
+
+	var rateInterval int
+	if _, err := fmt.Sscanf(req.RateInterval, "%d", &rateInterval); err != nil || rateInterval < 1 {
+		utils.BadRequest(c, "限频间隔必须为正整数")
+		return
+	}
+
 	values := map[string]string{
 		constant.KeyWorkerCount:  req.WorkerCount,
 		constant.KeyQueueSize:    req.QueueSize,
diff --git a/internal/executor/scheduler.go b/internal/executor/scheduler.go
index 4c7bf3b..7c11289 100644
--- a/internal/executor/scheduler.go
+++ b/internal/executor/scheduler.go
@@ -208,9 +208,15 @@ func NewScheduler(config SchedulerConfig, handler SchedulerEventHandler) *Schedu
 	if config.WorkerCount <= 0 {
 		config.WorkerCount = 4
 	}
+	if config.WorkerCount > 1000 {
+		config.WorkerCount = 1000
+	}
 	if config.QueueSize <= 0 {
 		config.QueueSize = 100
 	}
+	if config.QueueSize > 50000 {
+		config.QueueSize = 50000
+	}
 	if config.RateInterval <= 0 {
 		config.RateInterval = 200 * time.Millisecond
 	}