diff --git a/src/main/java/com/loafle/bridge/discoveryhistory/DiscoveryHistory.java b/src/main/java/com/loafle/bridge/discoveryhistory/DiscoveryHistory.java
index ccc2ed6..fe08b2b 100644
--- a/src/main/java/com/loafle/bridge/discoveryhistory/DiscoveryHistory.java
+++ b/src/main/java/com/loafle/bridge/discoveryhistory/DiscoveryHistory.java
@@ -25,7 +25,7 @@ public class DiscoveryHistory
     private Boolean result;
 
     @JoinColumn
-    @OneToOne(cascade = CascadeType.ALL)
+    @OneToOne(mappedBy = "discovery",cascade = CascadeType.ALL)
     private DiscoveryZone zone;
 
     public DiscoveryZone getZone() {
diff --git a/src/main/java/com/loafle/bridge/discoveryport/DiscoveryPortController.java b/src/main/java/com/loafle/bridge/discoveryport/DiscoveryPortController.java
index 08ed111..08b5ad8 100644
--- a/src/main/java/com/loafle/bridge/discoveryport/DiscoveryPortController.java
+++ b/src/main/java/com/loafle/bridge/discoveryport/DiscoveryPortController.java
@@ -64,6 +64,7 @@ public class DiscoveryPortController {
         String ip = "3232235983";
         z.setCidr(Long.parseLong(cidr));
         z.setIp(Long.parseLong(ip));
+        z.setDiscovery(d);
 
         d.setZone(z);
         // host scan histories
diff --git a/src/main/java/com/loafle/bridge/discoveryzone/DiscoveryZone.java b/src/main/java/com/loafle/bridge/discoveryzone/DiscoveryZone.java
index 2015d7d..9e5e983 100644
--- a/src/main/java/com/loafle/bridge/discoveryzone/DiscoveryZone.java
+++ b/src/main/java/com/loafle/bridge/discoveryzone/DiscoveryZone.java
@@ -1,5 +1,6 @@
 package com.loafle.bridge.discoveryzone;
 
+import com.loafle.bridge.discoveryhistory.DiscoveryHistory;
 import com.loafle.bridge.discoveryhost.DiscoveryHost;
 
 import javax.persistence.*;
@@ -22,6 +23,10 @@ public class DiscoveryZone {
     @Column(nullable=false)
     private long cidr;
 
+    @JoinColumn
+    @OneToOne
+    private DiscoveryHistory discovery;
+
     @OneToMany(mappedBy = "zone", cascade = CascadeType.ALL)
     private List<HostScanHistory> hostScanHistories;
 
@@ -67,4 +72,12 @@ public class DiscoveryZone {
     public void setCidr(long cidr) {
         this.cidr = cidr;
     }
+
+    public DiscoveryHistory getDiscovery() {
+        return discovery;
+    }
+
+    public void setDiscovery(DiscoveryHistory discovery) {
+        this.discovery = discovery;
+    }
 }