diff --git a/go.mod b/go.mod
index 475ff1c43..ce078a8e7 100644
--- a/go.mod
+++ b/go.mod
@@ -26,7 +26,6 @@ require (
 	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
 	github.com/leodido/go-urn v1.1.0 // indirect
 	github.com/mattn/go-colorable v0.1.2 // indirect
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/montanaflynn/stats v0.5.0
 	github.com/openzipkin/zipkin-go v0.2.1
 	github.com/otokaze/mock v0.0.0-20190125081256-8282b7a7c7c3
diff --git a/pkg/stat/sys/cpu/cgroupCPU.go b/pkg/stat/sys/cpu/cgroupCPU.go
index 4555a4bc1..db1372ae9 100644
--- a/pkg/stat/sys/cpu/cgroupCPU.go
+++ b/pkg/stat/sys/cpu/cgroupCPU.go
@@ -71,7 +71,6 @@ func newCgroupCPU() (cpu *cgroupCPU, err error) {
 		preSystem: preSystem,
 		preTotal:  preTotal,
 	}
-	fmt.Printf("get cpu info:%+v \n", cpu)
 	return
 }