diff --git a/xiaoqu-agent-service/src/main/java/me/iiv/agent/mcp/tool/DeviceLifecycleTools.java b/xiaoqu-agent-service/src/main/java/me/iiv/agent/mcp/tool/DeviceLifecycleTools.java
index fcd9c72..8bb9633 100644
--- a/xiaoqu-agent-service/src/main/java/me/iiv/agent/mcp/tool/DeviceLifecycleTools.java
+++ b/xiaoqu-agent-service/src/main/java/me/iiv/agent/mcp/tool/DeviceLifecycleTools.java
@@ -1,7 +1,6 @@
 package me.iiv.agent.mcp.tool;
 
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
-import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import me.iiv.agent.entity.m0.Agent;
 import me.iiv.agent.entity.m0.DeviceLifeCycle;
 import me.iiv.agent.entity.m0.District;
@@ -141,15 +140,18 @@ public class DeviceLifecycleTools implements ToolObject {
         boolean truncatedRows = rows != null && rows > MAX_ROWS;
         int pageSize = rows == null || rows < 1 ? DEFAULT_ROWS : Math.min(rows, MAX_ROWS);
 
-        Page<DeviceLifeCycle> result = deviceLifeCycleMapper.selectPage(new Page<>(pageNo, pageSize),
-                new LambdaQueryWrapper<DeviceLifeCycle>()
-                        .eq(DeviceLifeCycle::getSoftDelete, 0)
-                        .like(DeviceLifeCycle::getSnCode, snCode.trim())
-                        .orderByAsc(DeviceLifeCycle::getId));
+        // 项目未注册 MyBatis-Plus 分页拦截器，按惯例 selectCount + LIMIT 物理分页
+        LambdaQueryWrapper<DeviceLifeCycle> wrapper = new LambdaQueryWrapper<DeviceLifeCycle>()
+                .eq(DeviceLifeCycle::getSoftDelete, 0)
+                .like(DeviceLifeCycle::getSnCode, snCode.trim());
+        Long total = deviceLifeCycleMapper.selectCount(wrapper);
+        wrapper.orderByAsc(DeviceLifeCycle::getId)
+                .last("LIMIT " + (long) (pageNo - 1) * pageSize + "," + pageSize);
+        List<DeviceLifeCycle> cycles = deviceLifeCycleMapper.selectList(wrapper);
 
         Integer maxRoadDays = null;
         List<Map<String, Object>> records = new ArrayList<>();
-        for (DeviceLifeCycle cycle : result.getRecords()) {
+        for (DeviceLifeCycle cycle : cycles) {
             if (cycle.getRoadState() != null && cycle.getRoadState() == 1 && cycle.getRoadDate() != null
                     && maxRoadDays == null) {
                 maxRoadDays = maxRoadDays();
@@ -158,7 +160,7 @@ public class DeviceLifecycleTools implements ToolObject {
         }
 
         Map<String, Object> output = new LinkedHashMap<>();
-        output.put("total", result.getTotal());
+        output.put("total", total);
         output.put("page", pageNo);
         output.put("rows", pageSize);
         if (truncatedRows) {
diff --git a/xiaoqu-agent-service/src/test/java/me/iiv/agent/mcp/tool/DeviceLifecycleToolsTest.java b/xiaoqu-agent-service/src/test/java/me/iiv/agent/mcp/tool/DeviceLifecycleToolsTest.java
index cdf3cdf..8bcfdc7 100644
--- a/xiaoqu-agent-service/src/test/java/me/iiv/agent/mcp/tool/DeviceLifecycleToolsTest.java
+++ b/xiaoqu-agent-service/src/test/java/me/iiv/agent/mcp/tool/DeviceLifecycleToolsTest.java
@@ -1,8 +1,8 @@
 package me.iiv.agent.mcp.tool;
 
 import com.baomidou.mybatisplus.core.MybatisConfiguration;
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
-import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import me.iiv.agent.entity.m0.Agent;
 import me.iiv.agent.entity.m0.DeviceLifeCycle;
 import me.iiv.agent.entity.m0.District;
@@ -32,6 +32,7 @@ import org.apache.ibatis.builder.MapperBuilderAssistant;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.ArgumentCaptor;
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
 import org.springframework.data.redis.core.HashOperations;
@@ -127,17 +128,34 @@ class DeviceLifecycleToolsTest {
 
     @Test
     void queryTruncatesRowsOverLimitWithNotice() {
-        Page<DeviceLifeCycle> page = new Page<>(1, 100);
-        page.setTotal(0);
-        page.setRecords(List.of());
-        when(deviceLifeCycleMapper.selectPage(any(), any())).thenReturn(page);
+        when(deviceLifeCycleMapper.selectCount(any())).thenReturn(0L);
+        when(deviceLifeCycleMapper.selectList(any())).thenReturn(List.of());
 
         Map<String, Object> output = tools.hardwareDeviceLifecycleQuery("SN1", 1, 500);
 
+        assertEquals(0L, output.get("total"));
         assertEquals(100, output.get("rows"));
         assertEquals("rows 超过上限 100，已截断为 100", output.get("notice"));
     }
 
+    @Test
+    void queryPaginatesWithPhysicalLimit() {
+        when(deviceLifeCycleMapper.selectCount(any())).thenReturn(200L);
+        when(deviceLifeCycleMapper.selectList(any())).thenReturn(List.of());
+
+        Map<String, Object> output = tools.hardwareDeviceLifecycleQuery("X1A1", 2, 50);
+
+        assertEquals(200L, output.get("total"));
+        assertEquals(2, output.get("page"));
+        // 回归：项目未注册 MyBatis-Plus 分页拦截器，必须物理 LIMIT（2026-09-24 生产实测 selectPage 不分页且 total=0）
+        ArgumentCaptor<LambdaQueryWrapper<DeviceLifeCycle>> captor =
+                ArgumentCaptor.forClass(LambdaQueryWrapper.class);
+        verify(deviceLifeCycleMapper).selectList(captor.capture());
+        String sql = captor.getValue().getSqlSegment();
+        assertTrue(sql.contains("sn_code LIKE"));
+        assertTrue(sql.contains("LIMIT 50,50"));
+    }
+
     @Test
     void queryMapsEnumTextsIncludingUnknownAndInit() {
         DeviceLifeCycle cycle = new DeviceLifeCycle();
@@ -150,13 +168,12 @@ class DeviceLifecycleToolsTest {
         cycle.setNetworkState(1);
         cycle.setAssetState(2);
         cycle.setJindieSyncState(0);
-        Page<DeviceLifeCycle> page = new Page<>(1, 20);
-        page.setTotal(1);
-        page.setRecords(List.of(cycle));
-        when(deviceLifeCycleMapper.selectPage(any(), any())).thenReturn(page);
+        when(deviceLifeCycleMapper.selectCount(any())).thenReturn(1L);
+        when(deviceLifeCycleMapper.selectList(any())).thenReturn(List.of(cycle));
 
         Map<String, Object> output = tools.hardwareDeviceLifecycleQuery("SN-UNKNOWN", null, null);
 
+        assertEquals(1L, output.get("total"));
         @SuppressWarnings("unchecked")
         List<Map<String, Object>> records = (List<Map<String, Object>>) output.get("records");
         Map<String, Object> row = records.get(0);
@@ -181,10 +198,8 @@ class DeviceLifecycleToolsTest {
         cycle.setRoadState(1);
         cycle.setRoadDate(Date.from(LocalDate.now(SHANGHAI).minusDays(10)
                 .atStartOfDay(SHANGHAI).toInstant()));
-        Page<DeviceLifeCycle> page = new Page<>(1, 20);
-        page.setTotal(1);
-        page.setRecords(List.of(cycle));
-        when(deviceLifeCycleMapper.selectPage(any(), any())).thenReturn(page);
+        when(deviceLifeCycleMapper.selectCount(any())).thenReturn(1L);
+        when(deviceLifeCycleMapper.selectList(any())).thenReturn(List.of(cycle));
         when(redisTemplate.opsForHash()).thenReturn(hashOperations);
         when(hashOperations.get("Dictionary", "MaxRoadDays")).thenReturn("7");
 
@@ -205,10 +220,8 @@ class DeviceLifecycleToolsTest {
         cycle.setRoadState(1);
         cycle.setRoadDate(Date.from(LocalDate.now(SHANGHAI).minusDays(3)
                 .atStartOfDay(SHANGHAI).toInstant()));
-        Page<DeviceLifeCycle> page = new Page<>(1, 20);
-        page.setTotal(1);
-        page.setRecords(List.of(cycle));
-        when(deviceLifeCycleMapper.selectPage(any(), any())).thenReturn(page);
+        when(deviceLifeCycleMapper.selectCount(any())).thenReturn(1L);
+        when(deviceLifeCycleMapper.selectList(any())).thenReturn(List.of(cycle));
         when(redisTemplate.opsForHash()).thenReturn(hashOperations);
         when(hashOperations.get("Dictionary", "MaxRoadDays")).thenReturn("7");
 
@@ -227,10 +240,8 @@ class DeviceLifecycleToolsTest {
         cycle.setRoadState(1);
         cycle.setRoadDate(Date.from(LocalDate.now(SHANGHAI).minusDays(1)
                 .atStartOfDay(SHANGHAI).toInstant()));
-        Page<DeviceLifeCycle> page = new Page<>(1, 20);
-        page.setTotal(1);
-        page.setRecords(List.of(cycle));
-        when(deviceLifeCycleMapper.selectPage(any(), any())).thenReturn(page);
+        when(deviceLifeCycleMapper.selectCount(any())).thenReturn(1L);
+        when(deviceLifeCycleMapper.selectList(any())).thenReturn(List.of(cycle));
         when(redisTemplate.opsForHash()).thenReturn(hashOperations);
         when(hashOperations.get("Dictionary", "MaxRoadDays")).thenReturn(null);