diff --git a/src/main/java/entity/UserVotesId.java b/src/main/java/entity/UserVotesId.java
new file mode 100644
index 0000000..4c0ce5f
--- /dev/null
+++ b/src/main/java/entity/UserVotesId.java
@@ -0,0 +1,57 @@
+package entity;
+
+import java.io.Serializable;
+import java.util.Objects;
+
+public class UserVotesId implements Serializable {
+    private String userId;
+    private String begId;
+    private String seedId;
+
+    public UserVotesId() {}
+
+    public UserVotesId(String userId, String begId, String seedId) {
+        this.userId = userId;
+        this.begId = begId;
+        this.seedId = seedId;
+    }
+
+    // 重写 equals 和 hashCode 方法
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        UserVotesId that = (UserVotesId) o;
+        return userId.equals(that.userId) && begId.equals(that.begId) && seedId.equals(that.seedId);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(userId, begId, seedId);
+    }
+
+    // getters and setters
+    public String getUserId() {
+        return userId;
+    }
+
+    public void setUserId(String userId) {
+        this.userId = userId;
+    }
+
+    public String getBegId() {
+        return begId;
+    }
+
+    public void setBegId(String begId) {
+        this.begId = begId;
+    }
+
+    public String getSeedId() {
+        return seedId;
+    }
+
+    public void setSeedId(String seedId) {
+        this.seedId = seedId;
+    }
+}