diff --git a/metric/prometheus.go b/metric/prometheus.go
index 86e2c1b1..fac50f87 100644
--- a/metric/prometheus.go
+++ b/metric/prometheus.go
@@ -37,7 +37,7 @@ func PrometheusMiddleWare(next http.Handler) http.Handler {
 			"appname": beego.BConfig.AppName,
 		},
 		Help: "The statics info for http request",
-	}, []string{"pattern", "method", "status", "duration"})
+	}, []string{"pattern", "method", "status"})
 
 	prometheus.MustRegister(summaryVec)
 
@@ -95,5 +95,5 @@ func report(dur time.Duration, writer http.ResponseWriter, q *http.Request, vec
 		logs.Warn("we can not find the router info for this request, so request will be recorded as UNKNOWN: " + q.URL.String())
 	}
 	ms := dur / time.Millisecond
-	vec.WithLabelValues(ptn, q.Method, strconv.Itoa(status), strconv.Itoa(int(ms))).Observe(float64(ms))
+	vec.WithLabelValues(ptn, q.Method, strconv.Itoa(status)).Observe(float64(ms))
 }
diff --git a/metric/prometheus_test.go b/metric/prometheus_test.go
index d82a6dec..fd722245 100644
--- a/metric/prometheus_test.go
+++ b/metric/prometheus_test.go
@@ -35,7 +35,7 @@ func TestPrometheusMiddleWare(t *testing.T) {
 		},
 		Method: "POST",
 	}
-	vec := prometheus.NewSummaryVec(prometheus.SummaryOpts{}, []string{"pattern", "method", "status", "duration"})
+	vec := prometheus.NewSummaryVec(prometheus.SummaryOpts{}, []string{"pattern", "method", "status"})
 
 	report(time.Second, writer, request, vec)
 	middleware.ServeHTTP(writer, request)