diff --git a/tenant-service/src/main/java/com/xuqm/tenant/config/PrivateDeploymentProperties.java b/tenant-service/src/main/java/com/xuqm/tenant/config/PrivateDeploymentProperties.java
index 729fda5..dccc3f8 100644
--- a/tenant-service/src/main/java/com/xuqm/tenant/config/PrivateDeploymentProperties.java
+++ b/tenant-service/src/main/java/com/xuqm/tenant/config/PrivateDeploymentProperties.java
@@ -23,12 +23,12 @@ public class PrivateDeploymentProperties {
     public String getMode() { return mode; }
     public void setMode(String mode) { this.mode = mode; }
 
-    public boolean isTenantRegisterEnabled() { return tenantRegisterEnabled; }
+    public boolean isTenantRegisterEnabled() { return isPrivate() ? false : tenantRegisterEnabled; }
     public void setTenantRegisterEnabled(boolean tenantRegisterEnabled) {
         this.tenantRegisterEnabled = tenantRegisterEnabled;
     }
 
-    public boolean isTenantBootstrapEnabled() { return tenantBootstrapEnabled; }
+    public boolean isTenantBootstrapEnabled() { return isPrivate() ? true : tenantBootstrapEnabled; }
     public void setTenantBootstrapEnabled(boolean tenantBootstrapEnabled) {
         this.tenantBootstrapEnabled = tenantBootstrapEnabled;
     }
diff --git a/tenant-service/src/main/java/com/xuqm/tenant/service/SystemUpdateService.java b/tenant-service/src/main/java/com/xuqm/tenant/service/SystemUpdateService.java
index abc108c..38e373d 100644
--- a/tenant-service/src/main/java/com/xuqm/tenant/service/SystemUpdateService.java
+++ b/tenant-service/src/main/java/com/xuqm/tenant/service/SystemUpdateService.java
@@ -7,6 +7,8 @@ import org.springframework.boot.context.event.ApplicationReadyEvent;
 import org.springframework.context.event.EventListener;
 import org.springframework.stereotype.Service;
 
+import com.xuqm.tenant.config.PrivateDeploymentProperties;
+
 import javax.sql.DataSource;
 import java.io.BufferedReader;
 import java.io.IOException;
@@ -47,9 +49,11 @@ public class SystemUpdateService {
     private String deployRoot;
 
     private final DataSource dataSource;
+    private final PrivateDeploymentProperties deployProps;
 
-    public SystemUpdateService(DataSource dataSource) {
+    public SystemUpdateService(DataSource dataSource, PrivateDeploymentProperties deployProps) {
         this.dataSource = dataSource;
+        this.deployProps = deployProps;
     }
 
     // ── 公开接口 ────────────────────────────────────────────────────────────────
@@ -409,6 +413,7 @@ public class SystemUpdateService {
 
         migrate_v20260101_drop_device_id_unique_index(emit);
         migrate_v20260527_push_license_operation_logs(emit);
+        migrate_v20260527_consolidate_private_tenants(emit);
         // 新版本迁移在此追加，例如：
         // migrate_v20260601_add_app_extra_column(emit);
 
@@ -509,6 +514,96 @@ public class SystemUpdateService {
         recordMigration(id, "push-service 和 license-service 新增操作日志表");
     }
 
+    /**
+     * 私有化部署下合并多租户：保留最早的租户，将其余租户的 tenant_id 全部替换，然后删除多余租户。
+     * 仅在 DEPLOYMENT_MODE=PRIVATE 时执行。
+     */
+    private void migrate_v20260527_consolidate_private_tenants(Consumer<String> emit) {
+        if (!deployProps.isPrivate()) {
+            return;
+        }
+        final String id = "v20260527_consolidate_private_tenants";
+        if (migrationApplied(id)) {
+            emit.accept("  [已应用] " + id);
+            return;
+        }
+        try (Connection conn = dataSource.getConnection()) {
+            // 1. 找到最早的租户
+            String keepId;
+            try (PreparedStatement ps = conn.prepareStatement(
+                    "SELECT id FROM t_tenant ORDER BY created_at ASC LIMIT 1");
+                 ResultSet rs = ps.executeQuery()) {
+                if (!rs.next()) {
+                    emit.accept("  [跳过] " + id + ": 无租户数据");
+                    recordMigration(id, "私有化合并多租户（无数据）");
+                    return;
+                }
+                keepId = rs.getString("id");
+            }
+
+            // 2. 统计需要迁移的租户数
+            int totalTenants;
+            try (PreparedStatement ps = conn.prepareStatement("SELECT COUNT(*) FROM t_tenant");
+                 ResultSet rs = ps.executeQuery()) {
+                rs.next();
+                totalTenants = rs.getInt(1);
+            }
+
+            if (totalTenants <= 1) {
+                emit.accept("  [跳过] " + id + ": 仅 " + totalTenants + " 个租户，无需合并");
+                recordMigration(id, "私有化合并多租户（仅" + totalTenants + "个）");
+                return;
+            }
+
+            emit.accept("  [合并] 保留最早租户 " + keepId + "，共 " + totalTenants + " 个租户");
+
+            // 3. 替换所有表中的 tenant_id
+            String[][] tables = {
+                    {"t_app", "tenant_id"},
+                    {"t_operation_log", "tenant_id"},
+                    {"t_migrate_key", "tenant_id"},
+            };
+            int totalUpdated = 0;
+            for (String[] tbl : tables) {
+                try (PreparedStatement ps = conn.prepareStatement(
+                        "UPDATE " + tbl[0] + " SET " + tbl[1] + " = ? WHERE " + tbl[1] + " != ?")) {
+                    ps.setString(1, keepId);
+                    ps.setString(2, keepId);
+                    int rows = ps.executeUpdate();
+                    if (rows > 0) {
+                        emit.accept("    " + tbl[0] + ": 更新 " + rows + " 行");
+                        totalUpdated += rows;
+                    }
+                }
+            }
+
+            // 4. 子账号的 parent_id 指向保留的租户
+            try (PreparedStatement ps = conn.prepareStatement(
+                    "UPDATE t_tenant SET parent_id = ? WHERE parent_id IS NOT NULL AND parent_id != ?")) {
+                ps.setString(1, keepId);
+                ps.setString(2, keepId);
+                int rows = ps.executeUpdate();
+                if (rows > 0) {
+                    emit.accept("    t_tenant.parent_id: 更新 " + rows + " 个子账号");
+                }
+            }
+
+            // 5. 删除多余租户
+            try (PreparedStatement ps = conn.prepareStatement(
+                    "DELETE FROM t_tenant WHERE id != ?")) {
+                ps.setString(1, keepId);
+                int deleted = ps.executeUpdate();
+                emit.accept("    删除多余租户: " + deleted + " 个");
+            }
+
+            emit.accept("  [已迁移] " + id + ": 合并完成，保留 " + keepId);
+            recordMigration(id, "私有化合并多租户，保留最早租户 " + keepId);
+        } catch (Exception e) {
+            emit.accept("  [错误] " + id + ": " + e.getMessage());
+            log.error("migration {} failed", id, e);
+        }
+    }
+
     // ── 重启核心 ────────────────────────────────────────────────────────────────
 
     private void restartAndSelfUpdate(Consumer<String> emit, String composeFile) {