diff --git a/ess/ess-api/src/main/java/cn/axzo/nanopart/ess/api/domain/CreateContractInfo.java b/ess/ess-api/src/main/java/cn/axzo/nanopart/ess/api/domain/CreateContractInfo.java
index 7dcb5265..f24467ec 100644
--- a/ess/ess-api/src/main/java/cn/axzo/nanopart/ess/api/domain/CreateContractInfo.java
+++ b/ess/ess-api/src/main/java/cn/axzo/nanopart/ess/api/domain/CreateContractInfo.java
@@ -1,23 +1,22 @@
 
 package cn.axzo.nanopart.ess.api.domain;
 
-import static java.util.stream.Collectors.toSet;
-
-import java.util.Collections;
-import java.util.List;
-import java.util.Set;
+import cn.axzo.nanopart.ess.api.domain.contract.Approver;
+import cn.axzo.nanopart.ess.api.enums.Constraint;
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import lombok.Getter;
+import lombok.Setter;
+import org.hibernate.validator.constraints.Range;
 
 import javax.validation.Valid;
 import javax.validation.constraints.NotBlank;
 import javax.validation.constraints.NotEmpty;
+import javax.validation.constraints.NotNull;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
 
-import org.hibernate.validator.constraints.Range;
-
-import com.fasterxml.jackson.annotation.JsonIgnore;
-
-import cn.axzo.nanopart.ess.api.domain.contract.Approver;
-import lombok.Getter;
-import lombok.Setter;
+import static java.util.stream.Collectors.toSet;
 
 /**
  * @author yanglin
@@ -39,6 +38,12 @@ public abstract class CreateContractInfo {
 	@NotEmpty(message = "approvers不能为空")
 	private List<Approver> approvers;
 
+	/**
+	 * 合同签署方的签署约束种类
+	 */
+	@NotNull(message = "approverConstraint不能为空")
+	private Constraint constraint = Constraint.ONE_PERSON_PER_ORG;
+
 	/**
 	 * 签署方签署控件（印章/签名等）的生成方式.
 	 * 0: 在合同流程发起时，由发起人指定签署方的签署控件的位置和数量
diff --git a/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/support/ContractSupport.java b/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/support/ContractSupport.java
index 82a7c20b..4a994bc7 100644
--- a/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/support/ContractSupport.java
+++ b/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/support/ContractSupport.java
@@ -1,17 +1,9 @@
 
 package cn.axzo.nanopart.ess.server.ess.support;
 
-import static java.util.stream.Collectors.toList;
-
-import java.util.Collections;
-import java.util.List;
-
-import org.springframework.stereotype.Component;
-
-import com.alibaba.fastjson.JSON;
-
 import cn.axzo.nanopart.ess.api.domain.CreateContractInfo;
 import cn.axzo.nanopart.ess.api.domain.contract.Approver;
+import cn.axzo.nanopart.ess.api.enums.Constraint;
 import cn.axzo.nanopart.ess.api.enums.EssContractState;
 import cn.axzo.nanopart.ess.api.request.CreateContractByFileRequest;
 import cn.axzo.nanopart.ess.api.response.CreateContractByFileResponse;
@@ -20,8 +12,16 @@ import cn.axzo.nanopart.ess.server.dao.EssOrgDao;
 import cn.axzo.nanopart.ess.server.entity.EssContract;
 import cn.axzo.nanopart.ess.server.entity.EssOrg;
 import cn.axzo.nanopart.ess.server.utils.BizAssertions;
+import com.alibaba.fastjson.JSON;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+
+import static java.util.stream.Collectors.toList;
 
 /**
  * @author yanglin
@@ -35,9 +35,23 @@ public class ContractSupport {
 	private final EssContractDao essContractDao;
 
 	public void validateCreateContract(CreateContractInfo contract) {
+		checkCreateContractConstraint(contract);
 		ensureOrgAuthorized(contract);
 	}
 
+	private void checkCreateContractConstraint(CreateContractInfo contract) {
+		if (contract.getConstraint() == Constraint.ONE_PERSON_PER_ORG) {
+			HashSet<Long> ouIds = new HashSet<>();
+			for (Approver approver : contract.getApprovers()) {
+				if (approver.getSignPerson() == null)
+					continue;
+				BizAssertions.assertFalse(ouIds.contains(approver.getOuId()), "同一单位不能有多个审批人, constraint={}",
+					Constraint.ONE_PERSON_PER_ORG);
+				ouIds.add(approver.getOuId());
+			}
+		}
+	}
+
 	private void ensureOrgAuthorized(CreateContractInfo contract) {
 		BizAssertions.assertNotNull(contract, "合同信息不能为空");
 		List<EssOrg> orgs = essOrgDao.getByOuIds(contract.getApproverOuIds());
@@ -60,6 +74,7 @@ public class ContractSupport {
 		contract.setEssFieldIds(Collections.emptyList());
 		contract.setState(EssContractState.INIT);
 		contract.setApprovers(request.getByFile().getApprovers());
+		contract.getOrCreateAssignment().setConstraint(request.getContract().getConstraint());
 		contract.setApproveDetails(Collections.emptyList());
 		contract.setRecordExt(new EssContract.RecordExt());
 		essContractDao.save(contract);