diff --git a/generic.go b/generic.go
index 427e6f333cfffa4cdeb3a89e4a89ea0112cbf886..e89f256fa80c18909996770eb6ae987e9073dd8c 100644
--- a/generic.go
+++ b/generic.go
@@ -180,7 +180,7 @@ func (self *NDFrame) Empty() Series {
 
 func (self *NDFrame) Records() []string {
 	ret := make([]string, self.Len())
-	self.apply(func(idx int, v any) {
+	self.Apply(func(idx int, v any) {
 		ret[idx] = AnyToString(v)
 	})
 	return ret
@@ -236,7 +236,7 @@ func (self *NDFrame) Mean() float64 {
 		return NaN()
 	}
 	fs := make([]float64, 0)
-	self.apply(func(idx int, v any) {
+	self.Apply(func(idx int, v any) {
 		f := AnyToFloat64(v)
 		fs = append(fs, f)
 	})
@@ -249,7 +249,7 @@ func (self *NDFrame) StdDev() float64 {
 		return NaN()
 	}
 	values := make([]float64, self.Len())
-	self.apply(func(idx int, v any) {
+	self.Apply(func(idx int, v any) {
 		values[idx] = AnyToFloat64(v)
 	})
 	stdDev := stat.StdDev(values, nil)
diff --git a/generic_apply.go b/generic_apply.go
index cba37d355a86fb3e63999f0e90618dda1310b834..b311406490e54151a93930794b2e687b0a921db6 100644
--- a/generic_apply.go
+++ b/generic_apply.go
@@ -2,7 +2,7 @@ package pandas
 
 import "reflect"
 
-func (self *NDFrame) apply(f func(idx int, v any)) {
+func (self *NDFrame) Apply(f func(idx int, v any)) {
 	vv := reflect.ValueOf(self.values)
 	vk := vv.Kind()
 	switch vk {
diff --git a/series.go b/series.go
index fcc57dbbb9d55358ef26e981a64cd0473a501983..618cf8f7a0465532a58ebe40d03edb15d13b9ad0 100644
--- a/series.go
+++ b/series.go
@@ -75,6 +75,8 @@ type Series interface {
 	Select(r Range) Series
 	// Append 增加一批记录
 	Append(values ...interface{})
+	// Apply 接受一个回调函数
+	Apply(f func(idx int, v any))
 }
 
 // NewSeries 指定类型创建序列