diff --git a/backend/mci-channel-wecom/src/main/java/com/sino/mci/channel/wecom/WeComBotSender.java b/backend/mci-channel-wecom/src/main/java/com/sino/mci/channel/wecom/WeComBotSender.java
index c94a23c..744c880 100644
--- a/backend/mci-channel-wecom/src/main/java/com/sino/mci/channel/wecom/WeComBotSender.java
+++ b/backend/mci-channel-wecom/src/main/java/com/sino/mci/channel/wecom/WeComBotSender.java
@@ -85,7 +85,11 @@ public class WeComBotSender {
     private String resolveWebhookUrl(Map<String, Object> extra, String key) {
         String customUrl = getString(extra, "webhook_url");
         if (customUrl != null && !customUrl.isBlank()) {
-            return String.format(customUrl, key);
+            if (customUrl.contains("%s")) {
+                return customUrl.replace("%s", key);
+            }
+            log.warn("[WeComBot] custom webhook_url missing %s placeholder; appending key param");
+            return customUrl.contains("?") ? customUrl + "&key=" + key : customUrl + "?key=" + key;
         }
         return String.format(DEFAULT_WEBHOOK_URL, key);
     }
diff --git a/backend/mci-server/src/main/java/com/sino/mci/send/service/SendService.java b/backend/mci-server/src/main/java/com/sino/mci/send/service/SendService.java
index aaf95f0..04adf47 100644
--- a/backend/mci-server/src/main/java/com/sino/mci/send/service/SendService.java
+++ b/backend/mci-server/src/main/java/com/sino/mci/send/service/SendService.java
@@ -6,6 +6,7 @@ import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.sino.mci.channel.adapter.registry.ChannelAdapterRegistry;
 import com.sino.mci.channel.common.dto.SendMessageRequest;
 import com.sino.mci.channel.common.dto.SendMessageResult;
+import com.sino.mci.channel.common.model.AccountType;
 import com.sino.mci.channel.common.model.ChannelType;
 import com.sino.mci.channel.common.spi.ChannelAdapter;
 import com.sino.mci.channel.entity.ChannelAccount;
@@ -79,6 +80,8 @@ public class SendService {
     private static final int SEND_STATUS_SUCCESS = 2;
     private static final int SEND_STATUS_FAILED = 3;
 
+    private static final int CONVERSATION_TYPE_SINGLE = 1;
+    private static final int CONVERSATION_TYPE_GROUP = 2;
     private static final int CONVERSATION_SCENE_INTERNAL = 1;
     private static final int CONVERSATION_SCENE_EXTERNAL = 2;
     private static final Set<Integer> ACCOUNT_TYPES_BOT = Set.of(6);
@@ -350,14 +353,22 @@ public class SendService {
             throw new BusinessException("会话不存在: " + conversationId);
         }
 
-        ChannelType channelType = resolveChannelTypeForScene(conversation.getConversationScene());
-        Set<Integer> accountTypes = resolveAccountTypesForScene(conversation.getConversationScene());
+        ChannelType channelType;
+        Set<Integer> accountTypes;
+        // 单聊未回填场景时保持旧行为，按 channelStrategy 默认 WECOM 路由；群聊必须按场景路由
+        if (conversation.getConversationType() != null && conversation.getConversationType() == CONVERSATION_TYPE_SINGLE) {
+            channelType = parseChannelType(extractChannelType(channelStrategy));
+            accountTypes = null;
+        } else {
+            channelType = resolveChannelTypeForScene(conversation.getConversationScene());
+            accountTypes = resolveAccountTypesForScene(conversation.getConversationScene());
+        }
 
         Long accountId = selectSendAccount(tenantCode, conversationId, channelType, accountTypes, channelStrategy);
         if (accountId == null) {
             accountId = conversation.getOwnerAccountId();
             ChannelAccount ownerAccount = accountMapper.selectById(accountId);
-            if (ownerAccount == null || !accountTypes.contains(ownerAccount.getAccountType())) {
+            if (ownerAccount == null || (accountTypes != null && !accountTypes.contains(ownerAccount.getAccountType()))) {
                 accountId = null;
             }
         }
@@ -970,6 +981,10 @@ public class SendService {
             if (StringUtils.hasText(account.getAccountId())) {
                 extra.put("account_id", account.getAccountId());
             }
+            if (account.getAccountType() != null && account.getAccountType() == AccountType.WECOM_BOT.getCode()
+                    && StringUtils.hasText(account.getExtInfo())) {
+                extra.put("webhook_url", account.getExtInfo());
+            }
         }
         extra.put("record_id", record.getId());
         extra.put("tenant_code", record.getTenantCode());