diff --git a/relay/helper/price_domain_test.go b/relay/helper/price_domain_test.go
new file mode 100644
index 00000000..0252d3dd
--- /dev/null
+++ b/relay/helper/price_domain_test.go
@@ -0,0 +1,68 @@
+package helper
+
+import (
+	"net/http/httptest"
+	"testing"
+
+	relaycommon "github.com/QuantumNous/new-api/relay/common"
+	"github.com/QuantumNous/new-api/setting/ratio_setting"
+
+	"github.com/gin-gonic/gin"
+)
+
+// 验证「域名 × 命中分组 → 系数」在 HandleGroupRatio 里正确生效。
+// 模拟方式 B：通过 X-Forwarded-Host 头表示请求来自不同对外域名。
+func TestDomainRatioInHandleGroupRatio(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+
+	// 配置：api1 全部分组 ×1.2；api2 默认 ×1.5，但命中 vip 分组时 ×2.0
+	cfg := `{"api1.test":{"*":1.2},"api2.test":{"*":1.5,"vip":2.0}}`
+	if err := ratio_setting.UpdateDomainRatioByJSONString(cfg); err != nil {
+		t.Fatalf("加载 DomainRatio 配置失败: %v", err)
+	}
+	if !ratio_setting.HasDomainRatioConfigured() {
+		t.Fatal("HasDomainRatioConfigured 应为 true")
+	}
+
+	newCtx := func(host string) *gin.Context {
+		w := httptest.NewRecorder()
+		c, _ := gin.CreateTestContext(w)
+		c.Request = httptest.NewRequest("POST", "/v1/chat/completions", nil)
+		if host != "" {
+			c.Request.Header.Set("X-Forwarded-Host", host)
+		}
+		return c
+	}
+
+	// 基线：未命中任何域名配置 → 系数 1（GetGroupRatio("vip") 缺省也为 1）
+	base := HandleGroupRatio(newCtx("unknown.test"), &relaycommon.RelayInfo{UsingGroup: "vip"}).GroupRatio
+	if base != 1 {
+		t.Fatalf("基线倍率应为 1，实际 %v", base)
+	}
+
+	cases := []struct {
+		name  string
+		host  string
+		group string
+		want  float64
+	}{
+		{"api1 任意分组用默认*", "api1.test", "vip", 1.2},
+		{"api1 端口应被忽略", "api1.test:3000", "default", 1.2},
+		{"api2 命中vip用专属系数", "api2.test", "vip", 2.0},
+		{"api2 其它分组回退*", "api2.test", "default", 1.5},
+		{"未配置域名不影响", "other.test", "vip", 1.0},
+		{"无Host头不影响", "", "vip", 1.0},
+	}
+
+	for _, tc := range cases {
+		got := HandleGroupRatio(newCtx(tc.host), &relaycommon.RelayInfo{UsingGroup: tc.group}).GroupRatio
+		if got != tc.want {
+			t.Errorf("[%s] host=%q group=%q 期望倍率 %v，实际 %v", tc.name, tc.host, tc.group, tc.want, got)
+		} else {
+			t.Logf("[OK] %s → %v", tc.name, got)
+		}
+	}
+
+	// 清理，避免影响其它测试
+	_ = ratio_setting.UpdateDomainRatioByJSONString(`{}`)
+}