diff --git a/src/main/java/org/bdware/sc/boundry/utils/MultiTagIndexDBUtil.java b/src/main/java/org/bdware/sc/boundry/utils/MultiTagIndexDBUtil.java
new file mode 100644
index 0000000..7630a92
--- /dev/null
+++ b/src/main/java/org/bdware/sc/boundry/utils/MultiTagIndexDBUtil.java
@@ -0,0 +1,136 @@
+package org.bdware.sc.boundry.utils;
+
+import com.google.gson.JsonObject;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.bdware.sc.ContractProcess;
+import org.bdware.sc.compiler.PermissionStub;
+import org.bdware.sc.db.MultiIndexTimeRocksDBUtil;
+import org.bdware.sc.node.Permission;
+import org.rocksdb.RocksDB;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@PermissionStub(permission = Permission.MultiTagIndexDB)
+public class MultiTagIndexDBUtil {
+    private static final Logger LOGGER = LogManager.getLogger(MultiIndexTimeRocksDBUtil.class);
+
+    static Map<String, MultiTagIndexDBUtil> cacheDB = new HashMap<>();
+
+    static {
+        RocksDB.loadLibrary();
+    }
+
+    MultiIndexTimeRocksDBUtil rocksDB;
+    String path;
+
+    public MultiTagIndexDBUtil(String path, String tableName) {
+        try {
+            this.path = path;
+            File parent = new File("./ContractDB/" + ContractProcess.getContractDir());
+            File dir = new File(parent, path);
+
+            LOGGER.info("init RocksDB in " + dir.getAbsolutePath());
+            if (!dir.exists()) {
+                LOGGER.trace("create directory " + dir.getAbsolutePath() + ": " + dir.mkdirs());
+            }
+            File lockFile = new File(dir, "LOCK");
+            LOGGER.trace("delete file" + lockFile.getAbsolutePath() + ": " + lockFile.delete());
+            rocksDB = new MultiIndexTimeRocksDBUtil(dir.getAbsolutePath(), tableName);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static MultiTagIndexDBUtil loadDB(String path, String tableName) {
+        if (cacheDB.containsKey(path)) {
+            return cacheDB.get(path);
+        }
+        MultiTagIndexDBUtil ret = new MultiTagIndexDBUtil(path, tableName);
+        cacheDB.put(path, ret);
+        return ret;
+    }
+
+    public void close() {
+        rocksDB.close();
+        cacheDB.remove(path);
+    }
+
+    public String get(String key) {
+        try {
+            return new String(rocksDB.get(key));
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public long size() {
+        try {
+            return rocksDB.size();
+        } catch (Exception e) {
+            e.printStackTrace();
+            return 0;
+        }
+    }
+
+
+    public void put(String label, String value) {
+        try {
+            rocksDB.put(label, value);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    public List<String> getTags(String prefix) {
+        return rocksDB.getIndexStartWith(prefix);
+    }
+
+    public List<String> getAllTags() {
+        List<String> list = rocksDB.getAllIndexKey();
+        return list;
+    }
+
+    public long getSize(String tag) {
+        try {
+            return rocksDB.size(tag);
+        } catch (Exception e) {
+            e.printStackTrace();
+
+        }
+        return 0L;
+    }
+
+    public long queryOffset(String tag, long startTimestamp) {
+        return rocksDB.queryOffset(tag, startTimestamp);
+    }
+
+    public List<JsonObject> queryByOffset(String tag, long offset, int count) {
+        return rocksDB.queryByOffset(tag, offset, count);
+    }
+
+    public List<Long> countInInterval(String tag, long startTime, long endTime, long interval) {
+        List<Long> ret = new ArrayList<>();
+        if (interval <= 0) return ret;
+        long start = rocksDB.queryOffset(tag, startTime);
+        long delta;
+        startTime += interval;
+        for (; startTime < endTime; startTime += interval) {
+            delta = rocksDB.queryOffset(tag, startTime);
+            ret.add(delta - start);
+            start = delta;
+        }
+        delta = rocksDB.queryOffset(tag, endTime);
+        ret.add(delta - start);
+        return ret;
+    }
+
+    public List<String> queryInInterval(String tag, long startTime, long endTime) {
+        return rocksDB.queryByDateAsString(tag, startTime, endTime);
+    }
+}
diff --git a/src/main/java/org/bdware/sc/engine/JSONTool.java b/src/main/java/org/bdware/sc/engine/JSONTool.java
index 7380af0..4e16a9a 100644
--- a/src/main/java/org/bdware/sc/engine/JSONTool.java
+++ b/src/main/java/org/bdware/sc/engine/JSONTool.java
@@ -6,6 +6,8 @@ import wrp.jdk.nashorn.internal.runtime.PropertyMap;
 import wrp.jdk.nashorn.internal.scripts.JO;
 
 import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
 import java.util.Set;
 
 public class JSONTool {
@@ -44,7 +46,40 @@ public class JSONTool {
         if (obj == null) return JsonNull.INSTANCE;
         if (obj.getClass() == wrp.jdk.nashorn.internal.runtime.Undefined.class)
             return JsonNull.INSTANCE;
-        if (obj.getClass() == ScriptObjectMirror.class) {
+        if (obj instanceof JsonElement) return (JsonElement) obj;
+        if (obj.getClass().isArray()) {
+            Object[] arr = (Object[]) obj;
+            recorded.add(obj);
+            JsonArray jsonArray = new JsonArray();
+            for (int i = 0; i < arr.length; i++) {
+                jsonArray.add(convertMirrorToJsonInternal(arr[i], recorded));
+            }
+            return jsonArray;
+        } else if (List.class.isAssignableFrom(obj.getClass())) {
+            List arr = (List) obj;
+            recorded.add(arr);
+            JsonArray jsonArray = new JsonArray();
+            for (int i = 0; i < arr.size(); i++) {
+                jsonArray.add(convertMirrorToJsonInternal(arr.get(i), recorded));
+            }
+            return jsonArray;
+        } else if (List.class.isAssignableFrom(obj.getClass())) {
+            List arr = (List) obj;
+            recorded.add(arr);
+            JsonArray jsonArray = new JsonArray();
+            for (int i = 0; i < arr.size(); i++) {
+                jsonArray.add(convertMirrorToJsonInternal(arr.get(i), recorded));
+            }
+            return jsonArray;
+        } else if (Set.class.isAssignableFrom(obj.getClass())) {
+            Set arr = (Set) obj;
+            recorded.add(arr);
+            JsonArray jsonArray = new JsonArray();
+            for (Object k : arr) {
+                jsonArray.add(convertMirrorToJsonInternal(k, recorded));
+            }
+            return jsonArray;
+        } else if (obj.getClass() == ScriptObjectMirror.class) {
             recorded.add(obj);
             ScriptObjectMirror som = (ScriptObjectMirror) obj;
             if (som.isFunction()) {
@@ -52,7 +87,6 @@ public class JSONTool {
             }
             if (som.isArray()) {
                 JsonArray jarray = new JsonArray();
-
                 for (String str : som.getOwnKeys(true)) {
                     try {
                         if (Integer.parseInt(str) >= 0)
@@ -95,6 +129,14 @@ public class JSONTool {
                 }
                 return jo;
             }
+        } else if (Map.class.isAssignableFrom(obj.getClass())) {
+            Map arr = (Map) obj;
+            recorded.add(arr);
+            JsonObject jsonObject = new JsonObject();
+            for (Object k : arr.keySet()) {
+                jsonObject.add(k.toString(), convertMirrorToJsonInternal(k, recorded));
+            }
+            return jsonObject;
         } else if (obj.getClass() == jdk.internal.dynalink.beans.StaticClass.class) {
             return JsonNull.INSTANCE;
         } else if (obj instanceof Number) {