diff --git a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/controller/ErpTimesheetPreAllocController.java b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/controller/ErpTimesheetPreAllocController.java
index 0e951eed..530136ab 100644
--- a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/controller/ErpTimesheetPreAllocController.java
+++ b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/controller/ErpTimesheetPreAllocController.java
@@ -17,6 +17,7 @@ import org.dromara.common.core.validate.AddGroup;
 import org.dromara.common.core.validate.EditGroup;
 import org.dromara.common.log.enums.BusinessType;
 import org.dromara.common.excel.utils.ExcelUtil;
+import org.dromara.oa.erp.domain.vo.ErpProjectInfoVo;
 import org.dromara.oa.erp.domain.vo.ErpTimesheetPreAllocVo;
 import org.dromara.oa.erp.domain.bo.ErpTimesheetPreAllocBo;
 import org.dromara.oa.erp.domain.vo.PreAllocDetailVo;
@@ -80,6 +81,15 @@ public class ErpTimesheetPreAllocController extends BaseController {
         return R.ok(erpTimesheetPreAllocService.getStaffAllocDetails(monthCode, projectId));
     }
 
+    /**
+     * 查询当前部门指定月份已填报工时的来源预投项目
+     */
+    @SaCheckPermission("oa/erp:timesheetPreAlloc:query")
+    @GetMapping("/listAvailableSourceProjects")
+    public R<List<ErpProjectInfoVo>> listAvailableSourceProjects(@NotBlank(message = "月份编码不能为空") String monthCode) {
+        return R.ok(erpTimesheetPreAllocService.listAvailableSourceProjects(monthCode));
+    }
+
     /**
      * 新增预投工时分配
      */
diff --git a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/IErpTimesheetPreAllocService.java b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/IErpTimesheetPreAllocService.java
index 2d7265ec..b3e92ea1 100644
--- a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/IErpTimesheetPreAllocService.java
+++ b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/IErpTimesheetPreAllocService.java
@@ -4,6 +4,7 @@ import org.dromara.oa.erp.domain.vo.ErpTimesheetPreAllocVo;
 import org.dromara.oa.erp.domain.bo.ErpTimesheetPreAllocBo;
 import org.dromara.common.mybatis.core.page.TableDataInfo;
 import org.dromara.common.mybatis.core.page.PageQuery;
+import org.dromara.oa.erp.domain.vo.ErpProjectInfoVo;
 import org.dromara.oa.erp.domain.vo.PreAllocDetailVo;
 
 import java.util.Collection;
@@ -59,6 +60,14 @@ public interface IErpTimesheetPreAllocService {
      */
     PreAllocDetailVo getStaffAllocDetails(String monthCode, Long projectId);
 
+    /**
+     * 查询当前部门指定月份已填报工时的来源预投项目
+     *
+     * @param monthCode 月份编码(YYYYMM)
+     * @return 来源预投项目列表
+     */
+    List<ErpProjectInfoVo> listAvailableSourceProjects(String monthCode);
+
     /**
      * 新增预投工时分配
      *
diff --git a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpTimesheetPreAllocServiceImpl.java b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpTimesheetPreAllocServiceImpl.java
index 61a545b0..512f625c 100644
--- a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpTimesheetPreAllocServiceImpl.java
+++ b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpTimesheetPreAllocServiceImpl.java
@@ -19,6 +19,7 @@ import org.dromara.oa.erp.domain.ErpTimesheetSummaryDetail;
 import org.dromara.oa.erp.domain.bo.ErpTimesheetPreAllocBo;
 import org.dromara.oa.erp.domain.bo.PreAllocStaffAllocBo;
 import org.dromara.oa.erp.domain.bo.PreAllocTargetBo;
+import org.dromara.oa.erp.domain.vo.ErpProjectInfoVo;
 import org.dromara.oa.erp.domain.vo.ErpTimesheetPreAllocVo;
 import org.dromara.oa.erp.domain.vo.PreAllocDetailVo;
 import org.dromara.oa.erp.domain.vo.PreAllocStaffAllocVo;
@@ -214,6 +215,45 @@ public class ErpTimesheetPreAllocServiceImpl implements IErpTimesheetPreAllocSer
         return detailVo;
     }
 
+    /**
+     * 查询当前部门指定月份已填报工时的来源预投项目
+     *
+     * @param monthCode 月份编码(YYYYMM)
+     * @return 来源预投项目列表
+     */
+    @Override
+    public List<ErpProjectInfoVo> listAvailableSourceProjects(String monthCode) {
+        validateMonthCode(monthCode);
+        Long deptId = LoginHelper.getDeptId();
+        ErpTimesheetSummary summary = getSingleSummaryOrNull(monthCode, deptId);
+        if (summary == null) {
+            return Collections.emptyList();
+        }
+
+        List<ErpTimesheetSummaryDetail> detailList = summaryDetailMapper.selectList(Wrappers.<ErpTimesheetSummaryDetail>lambdaQuery()
+            .select(ErpTimesheetSummaryDetail::getOriginalProjectId)
+            .eq(ErpTimesheetSummaryDetail::getSummaryId, summary.getSummaryId())
+            .eq(ErpTimesheetSummaryDetail::getIsProject, PROJECT_WORK)
+            .eq(ErpTimesheetSummaryDetail::getDelFlag, DEL_FLAG_NORMAL)
+            .isNotNull(ErpTimesheetSummaryDetail::getOriginalProjectId)
+            .gt(ErpTimesheetSummaryDetail::getOriginalHours, BigDecimal.ZERO));
+        List<Long> projectIds = detailList.stream()
+            .map(ErpTimesheetSummaryDetail::getOriginalProjectId)
+            .filter(Objects::nonNull)
+            .distinct()
+            .collect(Collectors.toList());
+        if (projectIds.isEmpty()) {
+            return Collections.emptyList();
+        }
+
+        return projectInfoMapper.selectVoList(Wrappers.<ErpProjectInfo>lambdaQuery()
+            .in(ErpProjectInfo::getProjectId, projectIds)
+            .eq(ErpProjectInfo::getProjectCategory, PRE_PROJECT_CATEGORY)
+            .eq(ErpProjectInfo::getDelFlag, DEL_FLAG_NORMAL)
+            .orderByAsc(ErpProjectInfo::getProjectCode)
+            .orderByAsc(ErpProjectInfo::getProjectName));
+    }
+
     /**
      * 新增预投工时分配
      *
@@ -349,6 +389,23 @@ public class ErpTimesheetPreAllocServiceImpl implements IErpTimesheetPreAllocSer
         return summaries.get(0);
     }
 
+    private ErpTimesheetSummary getSingleSummaryOrNull(String monthCode, Long deptId) {
+        if (deptId == null) {
+            throw new ServiceException("当前登录用户未绑定部门，无法进行预投工时分配");
+        }
+        List<ErpTimesheetSummary> summaries = summaryMapper.selectList(Wrappers.<ErpTimesheetSummary>lambdaQuery()
+            .eq(ErpTimesheetSummary::getMonthCode, monthCode)
+            .eq(ErpTimesheetSummary::getDeptId, deptId)
+            .eq(ErpTimesheetSummary::getDelFlag, DEL_FLAG_NORMAL));
+        if (summaries.isEmpty()) {
+            return null;
+        }
+        if (summaries.size() > 1) {
+            throw new ServiceException("当前部门该月份存在多个月汇总工时，请先修正月汇总数据");
+        }
+        return summaries.get(0);
+    }
+
     private ErpTimesheetSummary lockSummary(Long summaryId) {
         ErpTimesheetSummary summary = summaryMapper.selectOne(Wrappers.<ErpTimesheetSummary>lambdaQuery()
             .eq(ErpTimesheetSummary::getSummaryId, summaryId)