diff --git a/pkg/util/math.go b/pkg/util/math.go
index bf73885e7..1159ff59d 100644
--- a/pkg/util/math.go
+++ b/pkg/util/math.go
@@ -1,7 +1,6 @@
 package util
 
 import (
-	"math"
 	"strconv"
 
 	"github.com/c9s/bbgo/pkg/fixedpoint"
@@ -27,34 +26,3 @@ func FormatValue(val fixedpoint.Value, prec int) string {
 func FormatFloat(val float64, prec int) string {
 	return strconv.FormatFloat(val, 'f', prec, 64)
 }
-
-func ParseFloat(s string) (float64, error) {
-	if len(s) == 0 {
-		return 0.0, nil
-	}
-
-	return strconv.ParseFloat(s, 64)
-}
-
-func MustParseFloat(s string) float64 {
-	if len(s) == 0 {
-		return 0.0
-	}
-
-	v, err := strconv.ParseFloat(s, 64)
-	if err != nil {
-		panic(err)
-	}
-	return v
-}
-
-const epsilon = 0.0000001
-
-func Zero(v float64) bool {
-	return math.Abs(v) < epsilon
-}
-
-func NotZero(v float64) bool {
-	return math.Abs(v) > epsilon
-}
-
diff --git a/pkg/util/math_test.go b/pkg/util/math_test.go
index 96d96a301..c7d868219 100644
--- a/pkg/util/math_test.go
+++ b/pkg/util/math_test.go
@@ -1,36 +1 @@
 package util
-
-import "testing"
-
-func TestNotZero(t *testing.T) {
-	type args struct {
-		v float64
-	}
-	tests := []struct {
-		name string
-		args args
-		want bool
-	}{
-		{
-			name: "0",
-			args: args{
-				v: 0,
-			},
-			want: false,
-		},
-		{
-			name: "0.00001",
-			args: args{
-				v: 0.00001,
-			},
-			want: true,
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if got := NotZero(tt.args.v); got != tt.want {
-				t.Errorf("NotZero() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}