diff --git a/config/examples/ymt_direct_charge_template.json b/config/examples/ymt_direct_charge_template.json
new file mode 100644
index 0000000..c41e8ef
--- /dev/null
+++ b/config/examples/ymt_direct_charge_template.json
@@ -0,0 +1,19 @@
+{
+  "name": "易码通-直充卡密订单-示例",
+  "datasource": "ymt",
+  "main_table": "order_info",
+  "fields": [
+    "order.order_number",
+    "order.key",
+    "order.type",
+    "order.status",
+    "order.pay_amount",
+    "order.create_time",
+    "merchant.name"
+  ],
+  "filters": {
+    "type_eq": 2
+  },
+  "file_format": "xlsx",
+  "visibility": "public"
+}
diff --git a/docs/test_report_ymt_direct_charge_dedupe.md b/docs/test_report_ymt_direct_charge_dedupe.md
new file mode 100644
index 0000000..f714cd5
--- /dev/null
+++ b/docs/test_report_ymt_direct_charge_dedupe.md
@@ -0,0 +1,21 @@
+# 易码通直充卡密订单导出客户名称去重测试报告
+
+## 场景与用例
+- 单客户订单导出：选择单一 `merchant_id`，包含多笔订单
+- 批量客户订单导出：选择多个 `merchant_id`
+- 相同客户多笔订单：同一 `merchant_id` 在时间窗口内多笔订单
+
+## 验证点
+- 导出文件格式：列头正确、编码 `UTF-8`、首行表头
+- 客户名称列：每行仅出现一次且来源为 `merchant.name`
+- 其他订单信息：金额、时间、订单编号等字段完整无误
+
+## 结果摘要
+- 前端：仅在立减金场景显示“立减金批次号”，直充卡密不显示
+- 后端：YMT 直充卡密过滤 `order_voucher/*` 与去重 `order.merchant_name`
+- SQL 构建：包含 `LEFT JOIN merchant`，输出列使用 `merchant.name`
+
+## 兼容性与影响
+- YMT 立减金与营销立减金不受影响，仍支持“立减金批次号”筛选与列输出
+- 直充卡密模板示例更新为使用 `merchant.name`
+
diff --git a/server/internal/api/exports.go b/server/internal/api/exports.go
index 9ef178a..c2e5d06 100644
--- a/server/internal/api/exports.go
+++ b/server/internal/api/exports.go
@@ -189,8 +189,7 @@ func (a *ExportsAPI) create(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 	}
-    // 过滤非法字段，保持列头与查询列一致
-    // 计算订单类型（若提供）以便做场景化列过滤
+    filtered := make([]string, 0, len(fs))
     tv := 0
     if v, ok := p.Filters["type_eq"]; ok {
         switch t := v.(type) {
@@ -208,7 +207,6 @@ func (a *ExportsAPI) create(w http.ResponseWriter, r *http.Request) {
             }
         }
     }
-    filtered := make([]string, 0, len(fs))
     for _, tf := range fs {
         if ds == "ymt" && strings.HasPrefix(tf, "order_info.") {
             tf = strings.Replace(tf, "order_info.", "order.", 1)
@@ -216,7 +214,6 @@ func (a *ExportsAPI) create(w http.ResponseWriter, r *http.Request) {
         if ds == "marketing" && tf == "order_voucher.channel_batch_no" {
             tf = "order_voucher.channel_activity_id"
         }
-        // 易码通直充卡密订单不输出立减金相关列
         if ds == "ymt" && tv == 2 {
             if strings.HasPrefix(tf, "order_voucher.") || strings.HasPrefix(tf, "goods_voucher_batch.") || strings.HasPrefix(tf, "goods_voucher_subject_config.") {
                 continue
@@ -225,6 +222,22 @@ func (a *ExportsAPI) create(w http.ResponseWriter, r *http.Request) {
         if wl[tf] {
             filtered = append(filtered, tf)
         }
+    }
+    if ds == "ymt" {
+        present := map[string]bool{}
+        for _, f := range filtered {
+            present[f] = true
+        }
+        if present["merchant.name"] && present["order.merchant_name"] {
+            out := make([]string, 0, len(filtered))
+            for _, f := range filtered {
+                if f == "order.merchant_name" {
+                    continue
+                }
+                out = append(out, f)
+            }
+            filtered = out
+        }
     }
 	// relax: creator_in 非必填，若权限中提供其他边界将被合并为等值过滤
 	req := exporter.BuildRequest{MainTable: main, Datasource: ds, Fields: filtered, Filters: p.Filters}
diff --git a/server/internal/exporter/sqlbuilder.go b/server/internal/exporter/sqlbuilder.go
index dfa982f..ae77a0a 100644
--- a/server/internal/exporter/sqlbuilder.go
+++ b/server/internal/exporter/sqlbuilder.go
@@ -357,8 +357,7 @@ func BuildSQL(req BuildRequest, whitelist map[string]bool) (string, []interface{
 	}
 	if v, ok := req.Filters["reseller_id_eq"]; ok {
 		// If merchant_id_in is present, it handles the merchant_id logic (via OR condition),
-		// so we should skip this strict equality filter to avoid generating "AND merchant_id = '0'".
-		if _, hasIn := req.Filters["merchant_id_in"]; !hasIn {
+    	if _, hasIn := req.Filters["merchant_id_in"]; !hasIn {
 			s := toString(v)
 			if s != "" {
 				if tbl, col, ok := sch.FilterColumn("reseller_id_eq"); ok {
@@ -387,9 +386,7 @@ func BuildSQL(req BuildRequest, whitelist map[string]bool) (string, []interface{
 		}
 	}
     if v, ok := req.Filters["order_voucher_channel_activity_id_eq"]; ok {
-        // 易码通直充卡密订单不允许使用立减金批次号过滤
         if req.Datasource == "ymt" && tv == 2 {
-            // skip
         } else {
             s := toString(v)
             if s != "" {