diff --git a/pkg/monitor/alerting/conditions/mathreducer.go b/pkg/monitor/alerting/conditions/mathreducer.go
index 4579c0d440..524fb5daac 100644
--- a/pkg/monitor/alerting/conditions/mathreducer.go
+++ b/pkg/monitor/alerting/conditions/mathreducer.go
@@ -13,8 +13,13 @@ import (
 type mathReducer struct {
 	// Type is how the timeseries should be reduced.
 	// Ex: avg, sum, max, min, count
-	Type string
-	Opt  string
+	Type   string
+	Opt    string
+	Params []float64
+}
+
+func (s *mathReducer) GetParams() []float64 {
+	return s.Params
 }
 
 func (s *mathReducer) GetType() string {
@@ -169,8 +174,9 @@ func (reducer *mathReducer) mathValue(values []float64) (float64, error) {
 
 func newMathReducer(cond *monitor.Condition) (*mathReducer, error) {
 	return &mathReducer{
-		Type: cond.Type,
-		Opt:  cond.Operators[0],
+		Type:   cond.Type,
+		Opt:    cond.Operators[0],
+		Params: cond.Params,
 	}, nil
 
 }
diff --git a/pkg/monitor/alerting/conditions/reducer.go b/pkg/monitor/alerting/conditions/reducer.go
index dd25fa0b34..12441f12cd 100644
--- a/pkg/monitor/alerting/conditions/reducer.go
+++ b/pkg/monitor/alerting/conditions/reducer.go
@@ -29,13 +29,19 @@ import (
 type Reducer interface {
 	Reduce(series *tsdb.TimeSeries) (*float64, []string)
 	GetType() string
+	GetParams() []float64
 }
 
 // queryReducer reduces an timeseries to a float
 type queryReducer struct {
 	// Type is how the timeseries should be reduced.
 	// Ex: avg, sum, max, min, count
-	Type string
+	Type   string
+	Params []float64
+}
+
+func (s *queryReducer) GetParams() []float64 {
+	return s.Params
 }
 
 func (s *queryReducer) GetType() string {
@@ -134,7 +140,7 @@ func (s *queryReducer) Reduce(series *tsdb.TimeSeries) (*float64, []string) {
 		if value > 0 {
 			allNull = false
 		}
-	case "P95":
+	case "percentile":
 		var values []float64
 		for _, v := range series.Points {
 			if v.IsValid() {
@@ -142,10 +148,14 @@ func (s *queryReducer) Reduce(series *tsdb.TimeSeries) (*float64, []string) {
 				values = append(values, v.Value())
 			}
 		}
+		pNum := float64(95)
+		if len(s.Params) != 0 {
+			pNum = s.Params[0]
+		}
 		if len(values) >= 1 {
 			sort.Float64s(values)
 			length := len(values)
-			index := math.Floor(float64(length) * 0.95)
+			index := math.Floor(float64(length) * pNum / float64(100))
 			value = values[int64(index)]
 		}
 	}
@@ -157,8 +167,18 @@ func (s *queryReducer) Reduce(series *tsdb.TimeSeries) (*float64, []string) {
 	return &value, valArr
 }
 
-func newSimpleReducer(t string) *queryReducer {
-	return &queryReducer{Type: t}
+func newSimpleReducer(cond *monitor.Condition) *queryReducer {
+	return &queryReducer{
+		Type:   cond.Type,
+		Params: cond.Params,
+	}
+}
+
+func newSimpleReducerByType(typ string) *queryReducer {
+	return &queryReducer{
+		Type:   typ,
+		Params: []float64{},
+	}
 }
 
 func calculateDiff(series *tsdb.TimeSeries, allNull bool, value float64, fn func(float64, float64) float64) (bool, float64) {
@@ -199,7 +219,7 @@ var percentDiff = func(newest, oldest float64) float64 {
 
 func NewAlertReducer(cond *monitor.Condition) (Reducer, error) {
 	if len(cond.Operators) == 0 {
-		return newSimpleReducer(cond.Type), nil
+		return newSimpleReducer(cond), nil
 	}
 
 	if utils.IsInStringArray(cond.Operators[0], validators.CommonAlertReducerFieldOpts) {
diff --git a/pkg/monitor/alerting/conditions/reducer_test.go b/pkg/monitor/alerting/conditions/reducer_test.go
index 32640a8a60..b7c480a069 100644
--- a/pkg/monitor/alerting/conditions/reducer_test.go
+++ b/pkg/monitor/alerting/conditions/reducer_test.go
@@ -66,7 +66,7 @@ func TestSimpleReducer(t *testing.T) {
 		})
 
 		Convey("median should ignore null values", func() {
-			reducer := newSimpleReducer("median")
+			reducer := newSimpleReducerByType("median")
 			series := &tsdb.TimeSeries{
 				Name: "test time series",
 			}
@@ -90,7 +90,7 @@ func TestSimpleReducer(t *testing.T) {
 
 		Convey("count_non_null", func() {
 			Convey("with null values and real values", func() {
-				reducer := newSimpleReducer("count_non_null")
+				reducer := newSimpleReducerByType("count_non_null")
 				series := &tsdb.TimeSeries{
 					Name: "test time series",
 				}
@@ -105,7 +105,7 @@ func TestSimpleReducer(t *testing.T) {
 			})
 
 			Convey("with null values", func() {
-				reducer := newSimpleReducer("count_non_null")
+				reducer := newSimpleReducerByType("count_non_null")
 				series := &tsdb.TimeSeries{
 					Name: "test time series",
 				}
@@ -118,7 +118,7 @@ func TestSimpleReducer(t *testing.T) {
 		})
 
 		Convey("avg of number values and null values should ignore nulls", func() {
-			reduer := newSimpleReducer("avg")
+			reduer := newSimpleReducerByType("avg")
 			series := &tsdb.TimeSeries{
 				Name: "test time series",
 			}
@@ -147,7 +147,7 @@ func TestSimpleReducer(t *testing.T) {
 		})
 
 		Convey("diff with only nulls", func() {
-			reducer := newSimpleReducer("diff")
+			reducer := newSimpleReducerByType("diff")
 			series := &tsdb.TimeSeries{
 				Name: "test time serie",
 			}
@@ -174,7 +174,7 @@ func TestSimpleReducer(t *testing.T) {
 		})
 
 		Convey("percent_diff with only nulls", func() {
-			reducer := newSimpleReducer("percent_diff")
+			reducer := newSimpleReducerByType("percent_diff")
 			series := &tsdb.TimeSeries{
 				Name: "test time serie",
 			}
@@ -188,7 +188,7 @@ func TestSimpleReducer(t *testing.T) {
 }
 
 func testReducer(reducerType string, datapoints ...float64) float64 {
-	reducer := newSimpleReducer(reducerType)
+	reducer := newSimpleReducerByType(reducerType)
 	serires := &tsdb.TimeSeries{
 		Name: "test time series",
 	}