diff --git "a/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/Solution.java" "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/Solution.java"
new file mode 100644
index 0000000000000000000000000000000000000000..690f1319a4b9c95bca4a384a7d64370e46fbf5f6
--- /dev/null
+++ "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/Solution.java"
@@ -0,0 +1,40 @@
+class Solution {
+    public static void mergeSort(int[] nums) {
+        if (nums == null || nums.length == 0) {
+            return;
+        }
+        int[] helper = new int[nums.length];
+        mergeSort(nums, helper, 0, nums.length - 1);
+    }
+
+    private static void mergeSort(int[] nums, int[] helper, int low, int high) {
+        if (low < high) {
+            int middle = low + (high - low) / 2;
+            mergeSort(nums, helper, low, middle);
+            mergeSort(nums, helper, middle + 1, high);
+            merge(nums, helper, low, middle, high);
+        }
+    }
+
+    private static void merge(int[] nums, int[] helper, int low, int middle, int high) {
+        for (int i = low; i <= high; i++) {
+            helper[i] = nums[i];
+        }
+
+        int left = low;
+        int right = middle + 1;
+        int curr = low;
+        while (left <= middle && right <= high) {
+            if (helper[left] <= helper[right]) {
+                nums[curr++] = helper[left++];
+            } else {
+                nums[curr++] = helper[right++];
+            }
+        }
+
+        int remain = middle - left;
+        for (int i = 0; i <= remain; i++) {
+            nums[curr + i] = helper[left + i];
+        }
+    }
+}
\ No newline at end of file
diff --git "a/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/exercies.md" "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/exercies.md"
new file mode 100644
index 0000000000000000000000000000000000000000..54b8051b7f86043670007834fe4793dc20fa0d7e
--- /dev/null
+++ "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/exercies.md"
@@ -0,0 +1,29 @@
+# 归并排序
+
+你需要用归并排序算法,对数组进行排序,并输出按照升序排序的字符数字串
+
+## 输入描述
+
+你需要对输入的数组根据归并排序算法升序排序
+
+## 输出描述
+
+输出按照升序排序的数组
+
+## 输入样例
+
+输入nums数组为:
+1. int[] nums = new int{}[1,2,4,3,5,6,7,8];
+2. int[] nums = new int{}[1,5,6,10,12,15,2,4];
+3. int[] nums = new int{}[1,4,90,12,14,19,3,4];
+
+
+## 输出样例
+1. 1,2,3,4,5,6,7,8
+2. 1,2,4,5,6,10,12,15
+3. 1,3,4,4,12,14,19,90
+
+
+## 提示
+
+无
\ No newline at end of file
diff --git "a/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/1.in" "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/1.in"
new file mode 100644
index 0000000000000000000000000000000000000000..4454cf2fccf397895f2363be855c93c68cbcff10
--- /dev/null
+++ "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/1.in"
@@ -0,0 +1 @@
+int[] nums = new int{}[1,2,4,3,5,6,7,8];
\ No newline at end of file
diff --git "a/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/1.out" "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/1.out"
new file mode 100644
index 0000000000000000000000000000000000000000..9d4948b8a8d5fb020701f61cb8435a942d7ae90e
--- /dev/null
+++ "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/1.out"
@@ -0,0 +1 @@
+1,2,3,4,5,6,7,8
\ No newline at end of file
diff --git "a/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/2.in" "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/2.in"
new file mode 100644
index 0000000000000000000000000000000000000000..bac353332f0baa49e150bf528a67b14ff151f4a0
--- /dev/null
+++ "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/2.in"
@@ -0,0 +1 @@
+int[] nums = new int{}[1,5,6,10,12,15,2,4];
\ No newline at end of file
diff --git "a/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/2.out" "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/2.out"
new file mode 100644
index 0000000000000000000000000000000000000000..74b2936b9c877306eff97fb39d1268b93d2cd3ff
--- /dev/null
+++ "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/2.out"
@@ -0,0 +1 @@
+1,2,4,5,6,10,12,15
\ No newline at end of file
diff --git "a/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/3.in" "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/3.in"
new file mode 100644
index 0000000000000000000000000000000000000000..0da1596da1a5f41e445a957366a92c71b4436c35
--- /dev/null
+++ "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/3.in"
@@ -0,0 +1 @@
+int[] nums = new int{}[1,4,90,12,14,19,3,4];
\ No newline at end of file
diff --git "a/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/3.out" "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/3.out"
new file mode 100644
index 0000000000000000000000000000000000000000..82b8709c0017f931dc2ce2a94680dd22d8a36292
--- /dev/null
+++ "b/exercises/liufq/\344\270\255\347\255\211/\345\275\222\345\271\266\346\216\222\345\272\217/test_cases/3.out"
@@ -0,0 +1 @@
+1,3,4,4,12,14,19,90
\ No newline at end of file