diff --git a/src/popup/transfer.ts b/src/popup/transfer.ts
index ddbd0f7..31b3931 100644
--- a/src/popup/transfer.ts
+++ b/src/popup/transfer.ts
@@ -135,7 +135,22 @@ export function initTransfer(ctx: PopupCtx) {
 
       const { environments: existingEnvs, activeEnvId } = await loadEnvironments();
 
-      // 分支 A：导入 v3 环境结构 —— 按"环境名"匹配，已存在的环境跳过，新的环境整批导入
+      // 公共：构造一条 DomainConfig，允许 username/password 为空
+      const makeConfig = (cfg: any): DomainConfig => ({
+        id: cfg.id || genCfgId(),
+        domain: cfg.domain,
+        alias: cfg.alias || null,
+        username: cfg.username || "",
+        password: cfg.password || "",
+        autoSubmit: cfg.autoSubmit !== false,
+        usernameSelector: cfg.usernameSelector || null,
+        passwordSelector: cfg.passwordSelector || null,
+        submitSelector: cfg.submitSelector || null,
+        enabled: cfg.enabled !== false,
+        delayMs: cfg.delayMs || null,
+      });
+
+      // 分支 A：导入 v3 环境结构 —— 同名环境合并配置（按 domain 去重），新环境创建
       if (incomingEnvironments) {
         const existingNames = new Set(existingEnvs.map((e) => e.name));
         let addedEnvs = 0;
@@ -146,39 +161,31 @@ export function initTransfer(ctx: PopupCtx) {
             skippedCfgs += env?.configs?.length || 0;
             continue;
           }
+          let targetEnv: Environment;
           if (existingNames.has(env.name)) {
-            // 同名环境：跳过整个环境
-            skippedCfgs += env.configs?.length || 0;
-            continue;
+            // 同名环境：合并配置到现有环境
+            targetEnv = existingEnvs.find((e) => e.name === env.name)!;
+          } else {
+            // 新环境：创建后再合并
+            existingNames.add(env.name);
+            targetEnv = { id: genId(), name: env.name, configs: [] };
+            existingEnvs.push(targetEnv);
+            addedEnvs++;
           }
-          existingNames.add(env.name);
-          const newEnv: Environment = {
-            id: genId(),
-            name: env.name,
-            configs: [],
-          };
+          const seenDomains = new Set(targetEnv.configs.map((c) => c.domain));
           for (const cfg of env.configs || []) {
-            if (!cfg || !cfg.domain || !cfg.username || !cfg.password) {
+            if (!cfg?.domain) {
               skippedCfgs++;
               continue;
             }
-            newEnv.configs.push({
-              id: cfg.id || genCfgId(),
-              domain: cfg.domain,
-              alias: cfg.alias || null,
-              username: cfg.username,
-              password: cfg.password,
-              autoSubmit: cfg.autoSubmit !== false,
-              usernameSelector: cfg.usernameSelector || null,
-              passwordSelector: cfg.passwordSelector || null,
-              submitSelector: cfg.submitSelector || null,
-              enabled: cfg.enabled !== false,
-              delayMs: cfg.delayMs || null,
-            });
+            if (seenDomains.has(cfg.domain)) {
+              skippedCfgs++;
+              continue;
+            }
+            seenDomains.add(cfg.domain);
+            targetEnv.configs.push(makeConfig(cfg));
             addedCfgs++;
           }
-          existingEnvs.push(newEnv);
-          addedEnvs++;
         }
         await saveEnvironments(existingEnvs, activeEnvId ?? undefined);
         await ctx.renderEnvSelect();
@@ -188,12 +195,17 @@ export function initTransfer(ctx: PopupCtx) {
       }
 
       // 分支 B：导入 v1/v2 配置数组 —— 合并到当前激活环境，相同 domain 跳过
-      const curEnv = existingEnvs.find((e) => e.id === activeEnvId) || existingEnvs[0];
+      let curEnv = existingEnvs.find((e) => e.id === activeEnvId) || existingEnvs[0];
+      if (!curEnv) {
+        // 无任何环境时先创建一个，否则没有地方放配置
+        curEnv = { id: genId(), name: "默认", configs: [] };
+        existingEnvs.push(curEnv);
+      }
       const seenDomains = new Set(curEnv.configs.map((c) => c.domain));
       let added = 0;
       let skipped = 0;
       for (const cfg of incomingConfigs || []) {
-        if (!cfg || !cfg.domain || !cfg.username || !cfg.password) {
+        if (!cfg?.domain) {
           skipped++;
           continue;
         }
@@ -202,19 +214,7 @@ export function initTransfer(ctx: PopupCtx) {
           continue;
         }
         seenDomains.add(cfg.domain);
-        curEnv.configs.push({
-          id: cfg.id || genCfgId(),
-          domain: cfg.domain,
-          alias: cfg.alias || null,
-          username: cfg.username,
-          password: cfg.password,
-          autoSubmit: cfg.autoSubmit !== false,
-          usernameSelector: cfg.usernameSelector || null,
-          passwordSelector: cfg.passwordSelector || null,
-          submitSelector: cfg.submitSelector || null,
-          enabled: cfg.enabled !== false,
-          delayMs: cfg.delayMs || null,
-        });
+        curEnv.configs.push(makeConfig(cfg));
         added++;
       }
       await saveEnvironments(existingEnvs);