diff --git a/internal/handler/impedance.go b/internal/handler/impedance.go
index be8b822..e918f46 100644
--- a/internal/handler/impedance.go
+++ b/internal/handler/impedance.go
@@ -56,6 +56,15 @@ func (h *ImpedanceHandler) ReportImpedance(c *gin.Context) {
 		return
 	}
 
+	// 品牌/型号含乱码或控制字符、超长属于无效数据，静默丢弃
+	if !isValidHeadphoneText(brand) || !isValidHeadphoneText(headphoneModel) {
+		c.JSON(http.StatusOK, gin.H{
+			"code": 200,
+			"msg":  "操作成功",
+		})
+		return
+	}
+
 	impedance, err := strconv.Atoi(valueStr)
 	if err != nil {
 		c.JSON(http.StatusOK, gin.H{
@@ -65,18 +74,27 @@ func (h *ImpedanceHandler) ReportImpedance(c *gin.Context) {
 		return
 	}
 
+	// 阻抗值为 0 属于无效数据，静默丢弃
+	if impedance == 0 {
+		c.JSON(http.StatusOK, gin.H{
+			"code": 200,
+			"msg":  "操作成功",
+		})
+		return
+	}
+
 	brandNorm := normalizeHeadphoneText(brand)
 	modelNorm := normalizeHeadphoneText(headphoneModel)
 
 	impedanceInfo := map[string]any{
-		"mac_addr":              mac,
-		"device_model":          deviceModel,
-		"impedance_ohm":         impedance,
-		"headphone_brand":       brand,
-		"headphone_model":       headphoneModel,
-		"headphone_brand_norm":  brandNorm,
-		"headphone_model_norm":  modelNorm,
-		"ip_addr":               clientIP,
+		"mac_addr":             mac,
+		"device_model":         deviceModel,
+		"impedance_ohm":        impedance,
+		"headphone_brand":      brand,
+		"headphone_model":      headphoneModel,
+		"headphone_brand_norm": brandNorm,
+		"headphone_model_norm": modelNorm,
+		"ip_addr":              clientIP,
 	}
 
 	jsonData, err := json.Marshal(impedanceInfo)
@@ -110,6 +128,19 @@ func normalizeHeadphoneText(s string) string {
 	return strings.ToLower(strings.TrimSpace(s))
 }
 
+// isValidHeadphoneText 校验耳机品牌/型号：拒绝含乱码字符（U+FFFD）、控制字符及超长（>100 字符）的输入
+func isValidHeadphoneText(s string) bool {
+	if len(s) > 100 {
+		return false
+	}
+	for _, r := range s {
+		if r == '\ufffd' || r < 0x20 || r == 0x7f {
+			return false
+		}
+	}
+	return true
+}
+
 func impedanceRedisField(mac, brandNorm, modelNorm string) string {
 	return fmt.Sprintf("%s|%s|%s", mac, brandNorm, modelNorm)
 }