diff --git a/README.EN.md b/README.EN.md
index ac2763f..9b75453 100644
--- a/README.EN.md
+++ b/README.EN.md
@@ -10,6 +10,27 @@ Translated data of classical Chinese:
 
 - Historical Records, by Sima Qian (only a few, 21 for now)
 
+Data format
+
+```json
+[
+    {
+        "title": "",
+        "contents": [
+            {
+                "source": "",
+                "target": ""
+            },
+            {
+                "source": "",
+                "target": ""
+            },
+            ...
+        ]
+    }
+]
+```
+
 Statement
 
 |    |Samples|Max Length|Min Length|Average Length|Median Length|Standard Deviation|
diff --git a/README.md b/README.md
index 84a7018..49dfd7d 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,27 @@
 
 - 史记130篇（不全，目前21篇）
 
+数据集格式
+
+```json
+[
+    {
+        "title": "",
+        "contents": [
+            {
+                "source": "",
+                "target": ""
+            },
+            {
+                "source": "",
+                "target": ""
+            },
+            ...
+        ]
+    }
+]
+```
+
 数据集统计
 
 |    |样本数|最大长度|最小长度|长度平均值|长度中位数|长度标准差|