diff --git a/dbsync/src/main/java/com/taobao/tddl/dbsync/binlog/JsonConversion.java b/dbsync/src/main/java/com/taobao/tddl/dbsync/binlog/JsonConversion.java
index bcfd26b6..61fe9bc6 100644
--- a/dbsync/src/main/java/com/taobao/tddl/dbsync/binlog/JsonConversion.java
+++ b/dbsync/src/main/java/com/taobao/tddl/dbsync/binlog/JsonConversion.java
@@ -291,7 +291,7 @@ public class JsonConversion {
                         if (i > 0) {
                             buf.append(", ");
                         }
-                        buf.append('"').append(key(i, charset)).append('"');
+                        buf.append('"').append(escapse(key(i, charset))).append('"');
                         buf.append(": ");
                         element(i, charset).toJsonString(buf, charset);
                     }
diff --git a/dbsync/src/test/java/com/taobao/tddl/dbsync/binlog/JsonConversion_Json_ValueTest.java b/dbsync/src/test/java/com/taobao/tddl/dbsync/binlog/JsonConversion_Json_ValueTest.java
index 733d102c..f1c72d04 100644
--- a/dbsync/src/test/java/com/taobao/tddl/dbsync/binlog/JsonConversion_Json_ValueTest.java
+++ b/dbsync/src/test/java/com/taobao/tddl/dbsync/binlog/JsonConversion_Json_ValueTest.java
@@ -9,6 +9,8 @@ import org.junit.rules.Timeout;
 import com.taobao.tddl.dbsync.binlog.JsonConversion.Json_Value;
 import com.taobao.tddl.dbsync.binlog.JsonConversion.Json_enum_type;
 
+import java.nio.charset.Charset;
+
 public class JsonConversion_Json_ValueTest {
 
     @Rule
@@ -51,4 +53,27 @@ public class JsonConversion_Json_ValueTest {
 
         // Method is not expected to return due to exception thrown
     }
+
+    // test for 5127
+    @Test
+    public void testJsonKeyContainsSpecialCharacter() {
+
+        // {"internal_uri_rewrite": {"(.*)(/[^/]+\\.(mp|MP)4)$": "$1/mp4$2"}}
+        String jsonData = "{\"internal_uri_rewrite\": {\"(.*)(/[^/]+\\\\.(mp|MP)4)$\": \"$1/mp4$2\"}}";
+        byte[] data = new byte[]{1, 0, 74, 0, 11, 0, 20, 0, 0, 31, 0, 105, 110, 116, 101, 114, 110, 97, 108, 95, 117, 114, 105, 95, 114, 101, 119, 114, 105, 116, 101, 1, 0, 43, 0, 11, 0, 23, 0, 12, 34, 0, 40, 46, 42, 41, 40, 47, 91, 94, 47, 93, 43, 92, 46, 40, 109, 112, 124, 77, 80, 41, 52, 41, 36, 8, 36, 49, 47, 109, 112, 52, 36, 50};
+        final LogBuffer buffer = new LogBuffer(data, 0, 74);
+
+        Charset charset = Charset.forName("UTF-8");
+        Json_Value jsonValue = JsonConversion.parse_value(0, buffer, 74, charset);
+        StringBuilder builder = new StringBuilder();
+        jsonValue.toJsonString(builder, charset);
+
+
+        Assert.assertEquals(builder.toString(), jsonData);
+
+        Assert.assertEquals(jsonValue.key(0, charset), "internal_uri_rewrite");
+
+        Json_Value element = jsonValue.element(0, charset);
+        Assert.assertEquals(element.key(0, charset), "(.*)(/[^/]+\\.(mp|MP)4)$");
+    }
 }