diff --git a/back-end-projects/Explorer/src/main/java/com/github/ontio/controller/ActivityDataController.java b/back-end-projects/Explorer/src/main/java/com/github/ontio/controller/ActivityDataController.java
index d6500a4c..f25c4127 100644
--- a/back-end-projects/Explorer/src/main/java/com/github/ontio/controller/ActivityDataController.java
+++ b/back-end-projects/Explorer/src/main/java/com/github/ontio/controller/ActivityDataController.java
@@ -8,10 +8,7 @@
 import org.hibernate.validator.constraints.Length;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.validation.annotation.Validated;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.PathVariable;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.*;
 
 @Validated
 @Slf4j
@@ -29,4 +26,17 @@ public Anniversary6thDataDto queryAddress6thAnniversaryData(@PathVariable("addre
         return activityDataService.queryAddress6thAnniversaryData(address);
     }
 
+    @RequestLimit(count = 120)
+    @ApiOperation(value = "Get address tx count in a period")
+    @GetMapping(value = "/tx_count_in_period")
+    public Integer queryAddressTxCountInPeriod(@RequestParam @Length(min = 34, max = 42, message = "Incorrect address format") String address, @RequestParam(required = false) Integer startTime, @RequestParam(required = false) Integer endTime) {
+        return activityDataService.queryAddressTxCountInPeriod(address, startTime, endTime);
+    }
+
+    @RequestLimit(count = 120)
+    @ApiOperation(value = "Get address balance at a certain time")
+    @GetMapping(value = "/certain_time_balance")
+    public String queryAddressCertainTimeBalance(@RequestParam @Length(min = 34, max = 42, message = "Incorrect address format") String address, @RequestParam Integer timestamp) {
+        return activityDataService.queryAddressCertainTimeBalance(address, timestamp);
+    }
 }
diff --git a/back-end-projects/Explorer/src/main/java/com/github/ontio/mapper/TxDetailMapper.java b/back-end-projects/Explorer/src/main/java/com/github/ontio/mapper/TxDetailMapper.java
index 6eac26bb..23f8c233 100644
--- a/back-end-projects/Explorer/src/main/java/com/github/ontio/mapper/TxDetailMapper.java
+++ b/back-end-projects/Explorer/src/main/java/com/github/ontio/mapper/TxDetailMapper.java
@@ -6,6 +6,7 @@
 import org.springframework.stereotype.Repository;
 import tk.mybatis.mapper.common.Mapper;
 
+import java.math.BigDecimal;
 import java.util.List;
 import java.util.Map;
 
@@ -80,4 +81,8 @@ List<TransferTxDto> selectTransferTxsOfHashes(@Param("address") String address,
     Integer selectTransferTxsCountOfHashes(@Param("address") String address, @Param("hashes") List<String> contractHashes, @Param("assetNames") List<String> assetNames, @Param("tokenType") String tokenType);
 
     List<Map<String, Object>> selectByAddressAndTxTime(@Param("address") String address, @Param("startTime") Integer startTime, @Param("endTime") Integer endTime);
+
+    Integer selectFromTxCountInPeriod(String address, Integer startTime, Integer endTime);
+
+    BigDecimal selectAssetTransferAmountByAddress(String assetName, String fromAddress, String toAddress, Integer time);
 }
\ No newline at end of file
diff --git a/back-end-projects/Explorer/src/main/java/com/github/ontio/service/IActivityDataService.java b/back-end-projects/Explorer/src/main/java/com/github/ontio/service/IActivityDataService.java
index 1b14a781..969899b1 100644
--- a/back-end-projects/Explorer/src/main/java/com/github/ontio/service/IActivityDataService.java
+++ b/back-end-projects/Explorer/src/main/java/com/github/ontio/service/IActivityDataService.java
@@ -5,4 +5,8 @@
 public interface IActivityDataService {
 
     Anniversary6thDataDto queryAddress6thAnniversaryData(String address);
+
+    Integer queryAddressTxCountInPeriod(String address, Integer startTime, Integer endTime);
+
+    String queryAddressCertainTimeBalance(String address, Integer timestamp);
 }
diff --git a/back-end-projects/Explorer/src/main/java/com/github/ontio/service/impl/ActivityDataServiceImpl.java b/back-end-projects/Explorer/src/main/java/com/github/ontio/service/impl/ActivityDataServiceImpl.java
index b3168fc3..877ba878 100644
--- a/back-end-projects/Explorer/src/main/java/com/github/ontio/service/impl/ActivityDataServiceImpl.java
+++ b/back-end-projects/Explorer/src/main/java/com/github/ontio/service/impl/ActivityDataServiceImpl.java
@@ -6,8 +6,8 @@
 import com.github.ontio.common.Helper;
 import com.github.ontio.mapper.CommonMapper;
 import com.github.ontio.mapper.NodeInfoOnChainMapper;
-import com.github.ontio.mapper.NodeOverviewHistoryMapper;
 import com.github.ontio.mapper.Oep4TxDetailMapper;
+import com.github.ontio.mapper.TxDetailMapper;
 import com.github.ontio.model.dao.NodeInfoOnChain;
 import com.github.ontio.model.dto.Anniversary6thDataDto;
 import com.github.ontio.model.dto.GovernanceInfoDto;
@@ -30,7 +30,7 @@ public class ActivityDataServiceImpl implements IActivityDataService {
     @Autowired
     private CommonMapper commonMapper;
     @Autowired
-    private NodeOverviewHistoryMapper nodeOverviewHistoryMapper;
+    private TxDetailMapper txDetailMapper;
     @Autowired
     private Oep4TxDetailMapper oep4TxDetailMapper;
     @Autowired
@@ -107,4 +107,18 @@ public void initNodePublicKeyAddress() {
                     return addressList;
                 });
     }
+
+    @Override
+    public Integer queryAddressTxCountInPeriod(String address, Integer startTime, Integer endTime) {
+        return txDetailMapper.selectFromTxCountInPeriod(address, startTime, endTime);
+    }
+
+    @Override
+    public String queryAddressCertainTimeBalance(String address, Integer timestamp) {
+        BigDecimal ontBalance = new BigDecimal((String) sdk.getNativeAssetBalance(address).get(ConstantParam.ONT));
+        BigDecimal fromAmount = txDetailMapper.selectAssetTransferAmountByAddress(ConstantParam.ONT, address, null, timestamp);
+        BigDecimal toAmount = txDetailMapper.selectAssetTransferAmountByAddress(ConstantParam.ONT, null, address, timestamp);
+        BigDecimal certainTimeBalance = ontBalance.add(fromAmount).subtract(toAmount);
+        return certainTimeBalance.stripTrailingZeros().toPlainString();
+    }
 }
diff --git a/back-end-projects/Explorer/src/main/resources/mapper/TxDetailMapper.xml b/back-end-projects/Explorer/src/main/resources/mapper/TxDetailMapper.xml
index b0e73377..edf5e9c9 100644
--- a/back-end-projects/Explorer/src/main/resources/mapper/TxDetailMapper.xml
+++ b/back-end-projects/Explorer/src/main/resources/mapper/TxDetailMapper.xml
@@ -634,4 +634,33 @@
         block_height, block_index
         LIMIT 5000;
     </select>
+
+    <select id="selectFromTxCountInPeriod" resultType="Integer" useCache="true">
+        SELECT COUNT(DISTINCT tx_hash)
+        FROM tbl_tx_detail
+        <where>
+            from_address = #{address}
+            <if test="startTime != null">
+                AND tx_time >= #{startTime}
+            </if>
+            <if test="endTime != null">
+                AND tx_time <![CDATA[<= #{endTime}]]>
+            </if>
+        </where>
+    </select>
+
+    <select id="selectAssetTransferAmountByAddress" resultType="BigDecimal" useCache="true">
+        SELECT IFNULL(SUM(amount),0)
+        FROM tbl_tx_detail
+        <where>
+            asset_name = #{assetName}
+            <if test="fromAddress !=null">
+                AND from_address = #{fromAddress}
+            </if>
+            <if test="toAddress !=null">
+                AND to_address = #{toAddress}
+            </if>
+            AND tx_time > #{time}
+        </where>
+    </select>
 </mapper>
\ No newline at end of file