diff --git a/Algorithms/0839. Similar String Groups/839. Similar String Groups.go b/Algorithms/0839. Similar String Groups/839. Similar String Groups.go
new file mode 100644
index 00000000..124fb661
--- /dev/null
+++ b/Algorithms/0839. Similar String Groups/839. Similar String Groups.go	
@@ -0,0 +1,27 @@
+package leetcode
+
+func numSimilarGroups(A []string) int {
+	uf := UnionFind{}
+	uf.init(len(A))
+	for i := 0; i < len(A); i++ {
+		for j := i + 1; j < len(A); j++ {
+			if isSimilar(A[i], A[j]) {
+				uf.union(i, j)
+			}
+		}
+	}
+	return uf.totalCount()
+}
+
+func isSimilar(a, b string) bool {
+	var n int
+	for i := 0; i < len(a); i++ {
+		if a[i] != b[i] {
+			n++
+			if n > 2 {
+				return false
+			}
+		}
+	}
+	return true
+}
diff --git a/Algorithms/0839. Similar String Groups/839. Similar String Groups_test.go b/Algorithms/0839. Similar String Groups/839. Similar String Groups_test.go
new file mode 100644
index 00000000..d469edc1
--- /dev/null
+++ b/Algorithms/0839. Similar String Groups/839. Similar String Groups_test.go	
@@ -0,0 +1,42 @@
+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question839 struct {
+	para839
+	ans839
+}
+
+// para 是参数
+// one 代表第一个参数
+type para839 struct {
+	one []string
+}
+
+// ans 是答案
+// one 代表第一个答案
+type ans839 struct {
+	one int
+}
+
+func Test_Problem839(t *testing.T) {
+
+	qs := []question839{
+
+		question839{
+			para839{[]string{"tars", "rats", "arts", "star"}},
+			ans839{2},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 839------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans839, q.para839
+		fmt.Printf("【input】:%v       【output】:%v\n", p, numSimilarGroups(p.one))
+	}
+	fmt.Printf("\n\n\n")
+}