diff --git a/src/main/java/com/iot/modbus_rtcp/config/EquipmentIPProperties.java b/src/main/java/com/iot/modbus_rtcp/config/EquipmentIPProperties.java
index 1ce43aa..af344eb 100644
--- a/src/main/java/com/iot/modbus_rtcp/config/EquipmentIPProperties.java
+++ b/src/main/java/com/iot/modbus_rtcp/config/EquipmentIPProperties.java
@@ -3,17 +3,20 @@ package com.iot.modbus_rtcp.config;
 import cn.hutool.core.map.MapUtil;
 import com.iot.modbus_rtcp.utils.HexUtil;
 import lombok.RequiredArgsConstructor;
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.stereotype.Service;
 
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.atomic.AtomicLong;
 
 @Service
 @RequiredArgsConstructor
 public class EquipmentIPProperties {
 
     private final JdbcTemplate jdbcTemplate;
+    private final AtomicLong lastSyncEquipment = new AtomicLong(System.currentTimeMillis());
     private final Map<String, String> identifiers = new ConcurrentHashMap<>();
 
     public String get(String key) {
@@ -30,14 +33,20 @@ public class EquipmentIPProperties {
         if (this.identifiers.containsKey(gatewayHeartbeat)) {
             return true;
         }
-        gatewayHeartbeat = gatewayHeartbeat.toUpperCase();
-        String gatewaySn = new String(HexUtil.hexStringToBytes(gatewayHeartbeat));
-        Map<String, Object> countMap = this.jdbcTemplate.queryForMap("select count(*) as ctn from device where gateway_sn = '" + gatewaySn + "'");
-        if (MapUtil.getInt(countMap, "ctn") > 0) {
-            this.identifiers.put(gatewayHeartbeat, gatewaySn);
-            return true;
+        if (gatewayHeartbeat.length() > 80) {
+            return false;
         }
-        return false;
+        // 每分钟从数据库入库一次
+        if (this.lastSyncEquipment.getAcquire() > System.currentTimeMillis() - 60_000) {
+            this.jdbcTemplate.queryForList("select gateway_sn from device").forEach(map -> {
+                String gatewaySn = StringUtils.trim(MapUtil.getStr(map, "gateway_sn", ""));
+                if (StringUtils.isNotBlank(gatewaySn)) {
+                    this.identifiers.put(HexUtil.bytesToHexString(gatewaySn.getBytes()).toUpperCase(), gatewaySn);
+                }
+            });
+            this.lastSyncEquipment.setRelease(System.currentTimeMillis());
+        }
+        return this.identifiers.containsKey(gatewayHeartbeat);
     }
 
 }
diff --git a/src/test/java/com/iot/modbus_rtcp/GatewayTest.java b/src/test/java/com/iot/modbus_rtcp/GatewayTest.java
index d02d12c..e73535b 100644
--- a/src/test/java/com/iot/modbus_rtcp/GatewayTest.java
+++ b/src/test/java/com/iot/modbus_rtcp/GatewayTest.java
@@ -1,5 +1,6 @@
 package com.iot.modbus_rtcp;
 
+import com.iot.modbus_rtcp.utils.CRCUtil;
 import com.iot.modbus_rtcp.utils.HexUtil;
 import org.junit.jupiter.api.Test;
 
@@ -15,26 +16,7 @@ public class GatewayTest {
         String s2 = "KENENG1400000358";
         System.out.println(new String(HexUtil.hexStringToBytes(s1)));
         System.out.println(HexUtil.bytesToHexString(s2.getBytes()));
-
-
-        String hex = "333538";
-        int decimal = 0;
-        int power = 0;
-        for (int i = hex.length() - 1; i >= 0; i--) {
-            char digit = hex.charAt(i);
-            if (digit >= '0' && digit <= '9') {
-                decimal += (digit - '0') * Math.pow(16, power);
-            } else if (digit >= 'A' && digit <= 'F') {
-                decimal += (digit - 'A' + 10) * Math.pow(16, power);
-            } else if (digit >= 'a' && digit <= 'f') {
-                decimal += (digit - 'a' + 10) * Math.pow(16, power);
-            } else {
-                throw new IllegalArgumentException("Invalid hex digit: " + digit);
-            }
-            power++;
-        }
-        System.out.println(decimal);
+        System.out.println(CRCUtil.verifyCRC(HexUtil.hexStringToBytes(s1)));
     }
 
-
 }