diff --git a/internal/model/dto/agent_open_api_dto.go b/internal/model/dto/agent_open_api_dto.go
index 9ac6853..b53dc4b 100644
--- a/internal/model/dto/agent_open_api_dto.go
+++ b/internal/model/dto/agent_open_api_dto.go
@@ -38,7 +38,8 @@ type AgentOpenAPIPackageTrafficItem struct {
 
 // AgentOpenAPICardTrafficResponse 开放接口卡流量响应
 type AgentOpenAPICardTrafficResponse struct {
-	CardNo                string                           `json:"card_no" description:"卡标识"`
+	CardNo                string                           `json:"card_no" description:"卡标识（原始传入值）"`
+	DeviceNo              string                           `json:"device_no,omitempty" description:"设备虚拟号（当入参被识别为设备维度时返回，表示该卡/标识关联的设备）"`
 	ActiveRemainingFlowMB int64                            `json:"active_remaining_flow_mb" description:"当前生效套餐剩余流量(MB)"`
 	ActiveTotalFlowMB     int64                            `json:"active_total_flow_mb" description:"当前生效套餐总流量(MB)"`
 	ActiveUsedFlowMB      int64                            `json:"active_used_flow_mb" description:"当前生效套餐已用流量(MB)"`
diff --git a/internal/routes/open.go b/internal/routes/open.go
index f9d0f99..b5c134a 100644
--- a/internal/routes/open.go
+++ b/internal/routes/open.go
@@ -74,8 +74,8 @@ function buildAgentSign({ method, path, query, body, timestamp, nonce, account,
 ` + "```"
 
 	Register(router, doc, basePath, "GET", "/cards/traffic", handler.GetCardTraffic, RouteSpec{
-		Summary:        "查询单卡流量",
-		Description:    authDescription + "\n\n按 card_no 查询单卡流量、当前套餐和待生效套餐。card_no 支持 ICCID、虚拟号、MSISDN。",
+		Summary:        "查询单卡或设备流量",
+		Description:    authDescription + "\n\n按 card_no 查询流量、当前套餐和待生效套餐。card_no 支持三种解析路径：1) ICCID/虚拟号/MSISDN 对应独立卡，查卡维度流量；2) 已绑定设备的卡，自动反查绑定设备，查设备维度流量（响应含 device_no）；3) IMEI 或设备虚拟号，直接查设备维度流量（响应含 device_no）。",
 		Input:          new(dto.AgentOpenAPICardQueryRequest),
 		Output:         new(dto.AgentOpenAPICardTrafficResponse),
 		Tags:           []string{tag},
diff --git a/internal/service/agent_open_api/service.go b/internal/service/agent_open_api/service.go
index 60b0da8..b10c8b9 100644
--- a/internal/service/agent_open_api/service.go
+++ b/internal/service/agent_open_api/service.go
@@ -72,20 +72,48 @@ func New(
 	}
 }
 
-// GetCardTraffic 查询开放接口单卡流量
+// GetCardTraffic 查询开放接口流量
+// 支持三种解析路径：
+// 1. card_no 解析为独立卡 → 查卡维度流量
+// 2. card_no 解析为已绑定设备的卡 → 反查绑定设备 → 查设备维度流量
+// 3. card_no 无法解析为卡 → 尝试作为设备标识（IMEI/虚拟号）→ 查设备维度流量
 func (s *Service) GetCardTraffic(ctx context.Context, req *dto.AgentOpenAPICardQueryRequest) (*dto.AgentOpenAPICardTrafficResponse, error) {
-	card, err := s.resolveOpenAPICard(ctx, req.CardNo)
-	if err != nil {
-		return nil, err
+	card, cardErr := s.resolveOpenAPICard(ctx, req.CardNo)
+	if cardErr == nil {
+		// 独立卡：直接查卡维度流量
+		if card.IsStandalone {
+			return s.buildCardTrafficResponse(ctx, req.CardNo, "iot_card", card.ID, "")
+		}
+		// 已绑定设备的卡：反查设备后查设备维度流量
+		binding, err := s.deviceSimBindingStore.GetActiveBindingByCardID(ctx, card.ID)
+		if err != nil {
+			return nil, errors.Wrap(errors.CodeInternalError, err, "查询卡绑定设备失败")
+		}
+		device, err := s.deviceStore.GetByID(ctx, binding.DeviceID)
+		if err != nil {
+			return nil, errors.Wrap(errors.CodeInternalError, err, "查询绑定设备信息失败")
+		}
+		return s.buildCardTrafficResponse(ctx, req.CardNo, "device", device.ID, device.VirtualNo)
 	}
 
+	// 兜底：尝试解析为设备标识（支持 IMEI/虚拟号）
+	device, err := s.resolveOpenAPIDevice(ctx, req.CardNo)
+	if err != nil {
+		// 两种解析都失败，返回原始卡解析错误（语义更贴近入参）
+		return nil, cardErr
+	}
+	return s.buildCardTrafficResponse(ctx, req.CardNo, "device", device.ID, device.VirtualNo)
+}
+
+// buildCardTrafficResponse 统一构造卡流量响应，支持卡和设备两种载体维度
+func (s *Service) buildCardTrafficResponse(ctx context.Context, cardNo, carrierType string, carrierID uint, deviceNo string) (*dto.AgentOpenAPICardTrafficResponse, error) {
 	activeStatus := constants.PackageUsageStatusActive
 	pendingStatus := constants.PackageUsageStatusPending
-	activeUsages, err := s.packageUsageStore.ListByCarrier(ctx, "iot_card", card.ID, &activeStatus)
+	activeUsages, err := s.packageUsageStore.ListByCarrier(ctx, carrierType, carrierID, &activeStatus)
 	if err != nil {
 		return nil, errors.Wrap(errors.CodeInternalError, err, "查询生效套餐失败")
 	}
-	pendingUsages, err := s.packageUsageStore.ListByCarrier(ctx, "iot_card", card.ID, &pendingStatus)
+	pendingUsages, err := s.packageUsageStore.ListByCarrier(ctx, carrierType, carrierID, &pendingStatus)
 	if err != nil {
 		return nil, errors.Wrap(errors.CodeInternalError, err, "查询待生效套餐失败")
 	}
@@ -96,7 +124,8 @@ func (s *Service) GetCardTraffic(ctx context.Context, req *dto.AgentOpenAPICardQ
 	}
 
 	resp := &dto.AgentOpenAPICardTrafficResponse{
-		CardNo:          req.CardNo,
+		CardNo:          cardNo,
+		DeviceNo:        deviceNo,
 		ActivePackages:  make([]dto.AgentOpenAPIPackageTrafficItem, 0, len(activeUsages)),
 		PendingPackages: make([]dto.AgentOpenAPIPackageTrafficItem, 0, len(pendingUsages)),
 	}
@@ -113,7 +142,6 @@ func (s *Service) GetCardTraffic(ctx context.Context, req *dto.AgentOpenAPICardQ
 	for _, usage := range pendingUsages {
 		resp.PendingPackages = append(resp.PendingPackages, s.buildTrafficItem(usage, packageMap, seriesMap, false))
 	}
-
 	return resp, nil
 }