diff --git a/generic.go b/generic.go
index 13c2534c2a4e7a53289650981b6128f0fc18d6af..381bc4ce74236394223be2f6ef58e7e5ebaad0d5 100644
--- a/generic.go
+++ b/generic.go
@@ -354,3 +354,27 @@ func (self *NDFrame) StdDev() float64 {
 	stdDev := stat.StdDev(values, nil)
 	return stdDev
 }
+
+func (self *NDFrame) FillNa(v any, inplace bool) {
+	values := self.Values()
+	switch rows := values.(type) {
+	case []string:
+		for idx, iv := range rows {
+			if StringIsNaN(iv) && inplace {
+				rows[idx] = AnyToString(v)
+			}
+		}
+	case []int64:
+		for idx, iv := range rows {
+			if IsNaN(float64(iv)) && inplace {
+				rows[idx] = AnyToInt64(v)
+			}
+		}
+	case []float64:
+		for idx, iv := range rows {
+			if IsNaN(iv) && inplace {
+				rows[idx] = AnyToFloat64(v)
+			}
+		}
+	}
+}
diff --git a/generic_test.go b/generic_test.go
index 5c5393f2c4a3bc3fca537e810eaa145a8b15b7c9..5672e6bc6d506c2c85cf96ca62777a65021832b5 100644
--- a/generic_test.go
+++ b/generic_test.go
@@ -74,6 +74,7 @@ func TestNDFrameNew(t *testing.T) {
 	// string
 	d2 := []string{"1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "nan", "12"}
 	nd2 := NewNDFrame[string]("x", d2...)
+	nd2.FillNa(0, true)
 	fmt.Println(nd2)
 	fmt.Println(nd2.Records())
 	fmt.Println(nd2.Empty())
diff --git a/series.go b/series.go
index 279efa81e01e0706d76668efa33cec88cd104f19..3bfa2eb4fe65c569ab28c6c29e55ba7e757326b8 100644
--- a/series.go
+++ b/series.go
@@ -56,6 +56,8 @@ type Series interface {
 	Mean() float64
 	// StdDev calculates the standard deviation of a series
 	StdDev() float64
+	// FillNa Fill NA/NaN values using the specified method.
+	FillNa(v any, inplace bool)
 }
 
 // NewSeries 指定类型创建序列
@@ -193,3 +195,25 @@ func Shift[T GenericType](s *Series, periods int, cbNan func() T) Series {
 	_ = naVals
 	return d
 }
+
+// FillNa 填充NaN的元素为v
+// inplace为真是修改series元素的值
+// 如果v和Values()返回值的slice类型不一致就会panic
+func FillNa[T GenericType](s *NDFrame, v T, inplace bool) *NDFrame {
+	values := s.Values()
+	switch rows := values.(type) {
+	case []string:
+		for idx, iv := range rows {
+			if StringIsNaN(iv) && inplace {
+				rows[idx] = AnyToString(v)
+			}
+		}
+	case []float64:
+		for idx, iv := range rows {
+			if IsNaN(iv) && inplace {
+				rows[idx] = AnyToFloat64(v)
+			}
+		}
+	}
+	return s
+}
diff --git a/series_bool.go b/series_bool.go
index 89cd78352eb5a90326e84ffe2a9e7afc3909ac56..aae892a102392ca2ea2cc02746f3b5cad2e4c60a 100644
--- a/series_bool.go
+++ b/series_bool.go
@@ -159,3 +159,16 @@ func (self *SeriesBool) StdDev() float64 {
 	//TODO implement me
 	panic("implement me")
 }
+
+// FillNa bool类型不可能在导入series还是NaN
+func (self *SeriesBool) FillNa(v any, inplace bool) {
+	//values := self.Values()
+	//switch rows := values.(type) {
+	//case []bool:
+	//	for idx, iv := range rows {
+	//		if IsNaN(float64(iv)) && inplace {
+	//			rows[idx] = AnyToFloat64(v)
+	//		}
+	//	}
+	//}
+}
diff --git a/series_float64.go b/series_float64.go
index 90c18eca766ce9db87db7f246a5dc672fb885ba8..4f2a4fa2f020c5e81778dbc651ac29183f1bd92e 100644
--- a/series_float64.go
+++ b/series_float64.go
@@ -221,3 +221,15 @@ func (self *SeriesFloat64) StdDev() float64 {
 	stdDev := stat.StdDev(values, nil)
 	return stdDev
 }
+
+func (self *SeriesFloat64) FillNa(v any, inplace bool) {
+	values := self.Values()
+	switch rows := values.(type) {
+	case []float64:
+		for idx, iv := range rows {
+			if IsNaN(iv) && inplace {
+				rows[idx] = AnyToFloat64(v)
+			}
+		}
+	}
+}
diff --git a/series_int64.go b/series_int64.go
index 2f117907451a92b7a8c6944b88a1b1e92c833b5e..588020963c6799085c1c9022a969db97b95e05e6 100644
--- a/series_int64.go
+++ b/series_int64.go
@@ -178,3 +178,16 @@ func (self *SeriesInt64) StdDev() float64 {
 	stdDev := stat.StdDev(d, nil)
 	return stdDev
 }
+
+// FillNa int64没有NaN
+func (self *SeriesInt64) FillNa(v any, inplace bool) {
+	values := self.Values()
+	switch rows := values.(type) {
+	case []int64:
+		for idx, iv := range rows {
+			if IsNaN(float64(iv)) && inplace {
+				rows[idx] = AnyToInt64(v)
+			}
+		}
+	}
+}
diff --git a/series_xstring.go b/series_xstring.go
index c149cef21ab759c629f5abc6077958ca74905f96..063c4c2cfe08e42e0c1bb96103eec5466210b0b4 100644
--- a/series_xstring.go
+++ b/series_xstring.go
@@ -164,3 +164,15 @@ func (self *SeriesString) StdDev() float64 {
 	//TODO implement me
 	panic("implement me")
 }
+
+func (self *SeriesString) FillNa(v any, inplace bool) {
+	values := self.Values()
+	switch rows := values.(type) {
+	case []string:
+		for idx, iv := range rows {
+			if StringIsNaN(iv) && inplace {
+				rows[idx] = AnyToString(v)
+			}
+		}
+	}
+}
diff --git a/type_bool.go b/type_bool.go
index 44803ddfe2ef562bf132d4393cd7855b88f888b0..b0a546fad9fb5aafd57b5c30c214183c286726fc 100644
--- a/type_bool.go
+++ b/type_bool.go
@@ -85,7 +85,7 @@ func AnyToBool(v any) bool {
 	}
 }
 
-// ParseFloat 字符串转float64
+// ParseBool 字符串转bool
 // 任意组合的nan字符串都会被解析成NaN
 func ParseBool(s string, v any) bool {
 	f, err := strconv.ParseBool(s)