diff --git a/jeecg-module-supervision/src/main/java/org/jeecg/modules/improvementproposal/controller/ImprovementProposalController.java b/jeecg-module-supervision/src/main/java/org/jeecg/modules/improvementproposal/controller/ImprovementProposalController.java
index 7541d3f..e4780b9 100644
--- a/jeecg-module-supervision/src/main/java/org/jeecg/modules/improvementproposal/controller/ImprovementProposalController.java
+++ b/jeecg-module-supervision/src/main/java/org/jeecg/modules/improvementproposal/controller/ImprovementProposalController.java
@@ -171,6 +171,22 @@ public class ImprovementProposalController {
 		}
 	}
 
+	/**
+	 * 删除运行中的流程并回退草稿。提案基本信息和业务附件会保留，流程产生的评分、投票数据会清空。
+	 */
+	@AutoLog(value = "改善提案-删除流程并回退草稿")
+	@Operation(summary = "改善提案-删除流程并回退草稿")
+	@RequiresPermissions("improvementproposal:improvement_proposal:delete")
+	@PostMapping(value = "/withdrawProcess")
+	public Result<String> withdrawProcess(@RequestParam(name = "id") String id) {
+		try {
+			improvementProposalService.withdrawProcess(id);
+			return Result.OK("流程已删除，提案已回退为草稿");
+		} catch (IllegalStateException e) {
+			return Result.error(e.getMessage());
+		}
+	}
+
 	@PostMapping(value = "/bpm/initialReview")
 	@Operation(summary = "保存部门精益专员初审结果")
 	public Result<String> saveInitialReview(@RequestBody ImprovementProposalBpmActionDTO action) {
diff --git a/jeecg-module-supervision/src/main/java/org/jeecg/modules/improvementproposal/service/IImprovementProposalService.java b/jeecg-module-supervision/src/main/java/org/jeecg/modules/improvementproposal/service/IImprovementProposalService.java
index 6eb58b4..bf720fc 100644
--- a/jeecg-module-supervision/src/main/java/org/jeecg/modules/improvementproposal/service/IImprovementProposalService.java
+++ b/jeecg-module-supervision/src/main/java/org/jeecg/modules/improvementproposal/service/IImprovementProposalService.java
@@ -31,6 +31,13 @@ public interface IImprovementProposalService extends IService<ImprovementProposa
 	 */
 	String startProcess(String id, String username);
 
+	/**
+	 * 删除当前运行中的改善提案流程，并将提案恢复为可编辑、可重新发起的草稿。
+	 *
+	 * @param id 提案主表 ID
+	 */
+	void withdrawProcess(String id);
+
 	/**
 	 * 添加一对多
 	 *
diff --git a/jeecg-module-supervision/src/main/java/org/jeecg/modules/improvementproposal/service/impl/ImprovementProposalServiceImpl.java b/jeecg-module-supervision/src/main/java/org/jeecg/modules/improvementproposal/service/impl/ImprovementProposalServiceImpl.java
index c0ff581..0e4a9dd 100644
--- a/jeecg-module-supervision/src/main/java/org/jeecg/modules/improvementproposal/service/impl/ImprovementProposalServiceImpl.java
+++ b/jeecg-module-supervision/src/main/java/org/jeecg/modules/improvementproposal/service/impl/ImprovementProposalServiceImpl.java
@@ -15,7 +15,16 @@ import org.jeecg.common.api.vo.Result;
 import org.jeecg.common.util.oConvertUtils;
 import org.jeecg.common.system.vo.LoginUser;
 import org.jeecg.modules.extbpm.process.service.impl.BpmBaseExtApiImpl;
+import org.jeecg.modules.extbpm.process.entity.ExtActBpmFile;
+import org.jeecg.modules.extbpm.process.entity.ExtActBpmLog;
+import org.jeecg.modules.extbpm.process.entity.ExtActFlowData;
+import org.jeecg.modules.extbpm.process.entity.ExtActTaskCc;
+import org.jeecg.modules.extbpm.process.service.IExtActBpmFileService;
+import org.jeecg.modules.extbpm.process.service.IExtActBpmLogService;
+import org.jeecg.modules.extbpm.process.service.IExtActFlowDataService;
 import org.jeecg.modules.extbpm.process.service.IExtActTaskCcService;
+import org.jeecg.modules.taskapprovalopinion.entity.TaskApprovalOpinion;
+import org.jeecg.modules.taskapprovalopinion.service.ITaskApprovalOpinionService;
 import org.springframework.stereotype.Service;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -39,6 +48,7 @@ import org.jeecg.modules.system.entity.SysDepart;
 import org.jeecg.modules.system.service.ISysRoleService;
 import org.jeecg.modules.system.service.ISysUserDepartService;
 import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.LinkedHashMap;
@@ -93,6 +103,14 @@ public class ImprovementProposalServiceImpl extends ServiceImpl<ImprovementPropo
 	private ISysUserDepartService sysUserDepartService;
 	@Autowired
 	private IExtActTaskCcService extActTaskCcService;
+	@Autowired
+	private ITaskApprovalOpinionService taskApprovalOpinionService;
+	@Autowired
+	private IExtActFlowDataService extActFlowDataService;
+	@Autowired
+	private IExtActBpmLogService extActBpmLogService;
+	@Autowired
+	private IExtActBpmFileService extActBpmFileService;
 
 	@Override
 	@Transactional(rollbackFor = Exception.class)
@@ -147,6 +165,77 @@ public class ImprovementProposalServiceImpl extends ServiceImpl<ImprovementPropo
 		saveMain(improvementProposal, null, null);
 	}
 
+	@Override
+	@Transactional(rollbackFor = Exception.class)
+	public void withdrawProcess(String id) {
+		ImprovementProposal proposal = getProcessingProposalForUpdate(id);
+		String processInstanceId = proposal.getProcessInstanceId();
+		long runtimeCount = runtimeService.createProcessInstanceQuery()
+			.processInstanceId(processInstanceId)
+			.count();
+		if (runtimeCount == 0) {
+			throw new IllegalStateException("当前流程已结束或不存在，不能删除流程");
+		}
+
+		// 改善提案未使用 task_task 中间表，按实例 ID 清理本轮流程数据，避免重新发起时读取到旧记录。
+		runtimeService.deleteProcessInstance(processInstanceId, "改善提案删除流程并回退草稿");
+		historyService.deleteHistoricProcessInstance(processInstanceId);
+		clearProcessRelatedData(processInstanceId);
+		improvementDeptScoreMapper.deleteByMainId(proposal.getId());
+		improvementInstituteVoteMapper.deleteByMainId(proposal.getId());
+
+		// MyBatis-Plus 默认会忽略实体中的 null；使用 UpdateWrapper 才能把上一轮流程结果真正清空。
+		LambdaUpdateWrapper<ImprovementProposal> resetWrapper = new LambdaUpdateWrapper<ImprovementProposal>()
+			.eq(ImprovementProposal::getId, proposal.getId())
+			.set(ImprovementProposal::getProcessInstanceId, null)
+			.set(ImprovementProposal::getBpmStatus, BPM_STATUS_DRAFT)
+			.set(ImprovementProposal::getInitialAward, null)
+			.set(ImprovementProposal::getNeedDeptScore, null)
+			.set(ImprovementProposal::getDeptAvgScore, null)
+			.set(ImprovementProposal::getSuggestedAward, null)
+			.set(ImprovementProposal::getLeaderFinalAward, null)
+			.set(ImprovementProposal::getIsneedvote, null)
+			.set(ImprovementProposal::getInstituteVoters, null)
+			.set(ImprovementProposal::getInstituteTotalVoters, null)
+			.set(ImprovementProposal::getInstituteAgreeCount, null)
+			.set(ImprovementProposal::getInstituteDisagreeCount, null)
+			.set(ImprovementProposal::getInstituteVoteResult, null)
+			.set(ImprovementProposal::getFinalAward, null)
+			.set(ImprovementProposal::getManualConfirmResult, null)
+			.set(ImprovementProposal::getArchiveBy, null)
+			.set(ImprovementProposal::getArchiveTime, null);
+		if (improvementProposalMapper.update(null, resetWrapper) != 1) {
+			throw new IllegalStateException("流程已删除，但提案回退草稿失败");
+		}
+	}
+
+	/** 清理仅属于本次流程实例的审批、抄送和日志数据，不影响提案申请附件。 */
+	private void clearProcessRelatedData(String processInstanceId) {
+		taskApprovalOpinionService.remove(new LambdaQueryWrapper<TaskApprovalOpinion>()
+			.eq(TaskApprovalOpinion::getProcessInstId, processInstanceId));
+		extActTaskCcService.remove(new LambdaQueryWrapper<ExtActTaskCc>()
+			.eq(ExtActTaskCc::getProcInstId, processInstanceId));
+		extActFlowDataService.remove(new LambdaQueryWrapper<ExtActFlowData>()
+			.eq(ExtActFlowData::getProcessInstId, processInstanceId));
+
+		List<ExtActBpmLog> bpmLogs = extActBpmLogService.list(new LambdaQueryWrapper<ExtActBpmLog>()
+			.eq(ExtActBpmLog::getProcInstId, processInstanceId));
+		if (!bpmLogs.isEmpty()) {
+			List<String> bpmLogIds = new ArrayList<>();
+			for (ExtActBpmLog bpmLog : bpmLogs) {
+				if (oConvertUtils.isNotEmpty(bpmLog.getId())) {
+					bpmLogIds.add(bpmLog.getId());
+				}
+			}
+			if (!bpmLogIds.isEmpty()) {
+				extActBpmFileService.remove(new LambdaQueryWrapper<ExtActBpmFile>()
+					.in(ExtActBpmFile::getBpmLogId, bpmLogIds));
+			}
+			extActBpmLogService.remove(new LambdaQueryWrapper<ExtActBpmLog>()
+				.eq(ExtActBpmLog::getProcInstId, processInstanceId));
+		}
+	}
+
 	@Override
 	public List<ImprovementProposalDepartmentDTO> getMyProposalDepartments(LoginUser loginUser) {
 		if (loginUser == null || oConvertUtils.isEmpty(loginUser.getId())) {
@@ -814,6 +903,23 @@ public class ImprovementProposalServiceImpl extends ServiceImpl<ImprovementPropo
 		}
 		return proposal;
 	}
+
+	/**
+	 * 撤回只能作用于正在运行的实例；通过主表行锁防止与流程办理、流程结束回写并发交叉。
+	 */
+	private ImprovementProposal getProcessingProposalForUpdate(String id) {
+		if (oConvertUtils.isEmpty(id)) {
+			throw new IllegalStateException("提案ID不能为空");
+		}
+		ImprovementProposal proposal = improvementProposalMapper.selectByIdForUpdate(id);
+		if (proposal == null) {
+			throw new IllegalStateException("未找到对应提案");
+		}
+		if (!"2".equals(proposal.getBpmStatus()) || oConvertUtils.isEmpty(proposal.getProcessInstanceId())) {
+			throw new IllegalStateException("仅处理中的提案允许删除流程");
+		}
+		return proposal;
+	}
 	
 	@Override
 	public Integer getLatestProposalSequence(Integer year) {