diff --git a/problems/0017_Letter_Combinations_of_a_Phone_Number/seaflower.go b/problems/0017_Letter_Combinations_of_a_Phone_Number/seaflower.go
new file mode 100644
index 00000000..dcb5df91
--- /dev/null
+++ b/problems/0017_Letter_Combinations_of_a_Phone_Number/seaflower.go
@@ -0,0 +1,45 @@
+import "fmt"
+
+//用遞迴的方式實作
+func LetterCombinations(digits string) []string {
+	if len(digits) < 1 {
+		return []string{}
+	}
+	if len(digits) == 1 {
+		switch digits {
+		case "2":
+			return []string{"a", "b", "c"}
+		case "3":
+			return []string{"d", "e", "f"}
+		case "4":
+			return []string{"g", "h", "i"}
+		case "5":
+			return []string{"j", "k", "l"}
+		case "6":
+			return []string{"m", "n", "o"}
+		case "7":
+			return []string{"q", "p", "r", "s"}
+		case "8":
+			return []string{"t", "u", "v"}
+		case "9":
+			return []string{"w", "x", "y", "z"}
+		case "0":
+			return []string{" "}
+		default:
+			return []string{""}
+		}
+	}
+
+	r := make([]string, 0)
+
+	for _, front := range LetterCombinations(digits[:1]) {
+		fmt.Println("digits[:1]", digits[:1], "value", front)
+		for _, back := range LetterCombinations(digits[1:]) {
+			fmt.Println("digits[1:]", digits[1:], "value", back)
+			r = append(r, front+back)
+		}
+	}
+
+	return r
+
+}
\ No newline at end of file