diff --git a/sundynix-gateway/internal/handler/admin.go b/sundynix-gateway/internal/handler/admin.go
index ed86f6a..a4eb4f2 100644
--- a/sundynix-gateway/internal/handler/admin.go
+++ b/sundynix-gateway/internal/handler/admin.go
@@ -286,6 +286,99 @@ func (h *Handler) SaveBillingConfig(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"status": "ok"})
 }
 
+// AdminTenants: GET /api/v1/admin/tenants —— 全平台租户目录（含成员数 + 余额）。
+func (h *Handler) AdminTenants(c *gin.Context) {
+	rows, err := h.db.ListTenants(c.Request.Context())
+	if err != nil {
+		c.JSON(http.StatusBadGateway, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"tenants": rows})
+}
+
+// AdminCreateTenant: POST /api/v1/admin/tenants {name, slug, owner_email?} —— 新建租户（可选指定 owner）。
+func (h *Handler) AdminCreateTenant(c *gin.Context) {
+	var b struct {
+		Name       string `json:"name"`
+		Slug       string `json:"slug"`
+		Plan       string `json:"plan"`
+		OwnerEmail string `json:"owner_email"`
+	}
+	if err := c.ShouldBindJSON(&b); err != nil || strings.TrimSpace(b.Name) == "" || strings.TrimSpace(b.Slug) == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "name 和 slug 必填"})
+		return
+	}
+	ctx := c.Request.Context()
+	t, err := h.db.CreateTenant(ctx, b.Name, b.Slug, b.Plan)
+	if err != nil {
+		c.JSON(http.StatusBadGateway, gin.H{"error": err.Error()})
+		return
+	}
+	if em := strings.TrimSpace(b.OwnerEmail); em != "" {
+		if _, err := h.db.AddMemberByEmail(ctx, t.ID, em, store.RoleOwner); err != nil {
+			c.JSON(http.StatusOK, gin.H{"tenant": t, "warn": "租户已建，但指定 owner 失败：" + err.Error()})
+			return
+		}
+	}
+	c.JSON(http.StatusOK, gin.H{"tenant": t})
+}
+
+// AdminMembers: GET /api/v1/admin/tenants/:id/members —— 某租户成员列表。
+func (h *Handler) AdminMembers(c *gin.Context) {
+	rows, err := h.db.ListMembers(c.Request.Context(), c.Param("id"))
+	if err != nil {
+		c.JSON(http.StatusBadGateway, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"members": rows})
+}
+
+// AdminAddMember: POST /api/v1/admin/tenants/:id/members {email, role} —— 按邮箱加成员。
+func (h *Handler) AdminAddMember(c *gin.Context) {
+	var b struct {
+		Email string `json:"email"`
+		Role  string `json:"role"`
+	}
+	if err := c.ShouldBindJSON(&b); err != nil || strings.TrimSpace(b.Email) == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "email 必填"})
+		return
+	}
+	if b.Role == "" {
+		b.Role = store.RoleMember
+	}
+	m, err := h.db.AddMemberByEmail(c.Request.Context(), c.Param("id"), strings.TrimSpace(b.Email), b.Role)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"member": m})
+}
+
+// AdminSetMemberRole: PUT /api/v1/admin/tenants/:id/members/:uid {role} —— 改成员角色。
+func (h *Handler) AdminSetMemberRole(c *gin.Context) {
+	var b struct {
+		Role string `json:"role"`
+	}
+	if err := c.ShouldBindJSON(&b); err != nil || b.Role == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "role 必填"})
+		return
+	}
+	if err := h.db.SetMemberRole(c.Request.Context(), c.Param("id"), c.Param("uid"), b.Role); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"status": "ok"})
+}
+
+// AdminRemoveMember: DELETE /api/v1/admin/tenants/:id/members/:uid —— 软移除成员。
+func (h *Handler) AdminRemoveMember(c *gin.Context) {
+	if err := h.db.RemoveMember(c.Request.Context(), c.Param("id"), c.Param("uid")); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"status": "ok"})
+}
+
 // GrantCredits: POST /api/v1/admin/credits/grant —— 给租户充值/发放积分（记账本 + 增余额）。
 func (h *Handler) GrantCredits(c *gin.Context) {
 	var b struct {
diff --git a/sundynix-gateway/internal/router/router.go b/sundynix-gateway/internal/router/router.go
index a0afa10..0ce61df 100644
--- a/sundynix-gateway/internal/router/router.go
+++ b/sundynix-gateway/internal/router/router.go
@@ -102,6 +102,13 @@ func New(db *store.Postgres, cache *store.Redis, bus *nats.Bus, blobStore *blob.
 			admin.GET("/billing-config", h.BillingConfig)  // 全局计费规则（token→积分汇率 + 硬拦截开关）
 			admin.PUT("/billing-config", h.SaveBillingConfig)
 			admin.POST("/credits/grant", h.GrantCredits) // 给租户充值/发放积分
+			// 多租户成员管理（平台运维口径）
+			admin.GET("/tenants", h.AdminTenants)                        // 租户目录（成员数+余额）
+			admin.POST("/tenants", h.AdminCreateTenant)                  // 新建租户（可选指定 owner）
+			admin.GET("/tenants/:id/members", h.AdminMembers)            // 成员列表
+			admin.POST("/tenants/:id/members", h.AdminAddMember)         // 按邮箱加成员
+			admin.PUT("/tenants/:id/members/:uid", h.AdminSetMemberRole) // 改角色
+			admin.DELETE("/tenants/:id/members/:uid", h.AdminRemoveMember) // 移除成员
 			admin.GET("/status", h.AdminStatus)      // 服务状态：基建/服务探活 + MCP 工具注册
 			admin.GET("/overview", h.AdminOverview)  // 系统级聚合：全平台用户/任务/评测/模型态/提示词态/健康
 			admin.GET("/usage", h.AdminUsage)        // 用量/积分/成本：全平台按天趋势 + 租户排行 / 单租户余额
diff --git a/sundynix-gateway/internal/store/tenant.go b/sundynix-gateway/internal/store/tenant.go
index 5fe8ecf..cd6dd6b 100644
--- a/sundynix-gateway/internal/store/tenant.go
+++ b/sundynix-gateway/internal/store/tenant.go
@@ -2,11 +2,23 @@ package store
 
 import (
 	"context"
+	"errors"
+	"strings"
+	"time"
 
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
 )
 
+// ValidRole 校验角色取值合法。
+func ValidRole(role string) bool {
+	switch role {
+	case RoleOwner, RoleAdmin, RoleMember, RoleViewer, RoleBillingAdmin:
+		return true
+	}
+	return false
+}
+
 // 角色/成员状态常量。
 const (
 	RoleOwner        = "owner"
@@ -161,3 +173,124 @@ func firstNonEmpty(a, b string) string {
 	}
 	return b
 }
+
+// ---- 成员管理（多成员租户）----
+
+// MemberInfo 是一条成员视图（join user 拿邮箱/名字）。
+type MemberInfo struct {
+	UserID   string    `json:"user_id"`
+	Email    string    `json:"email"`
+	Name     string    `json:"name"`
+	Role     string    `json:"role"`
+	Status   string    `json:"status"`
+	JoinedAt time.Time `json:"joined_at"`
+}
+
+// ListMembers 返回某租户的成员（含邮箱/名字/角色），排除已移除。
+func (p *Postgres) ListMembers(ctx context.Context, tenantID string) ([]MemberInfo, error) {
+	if p.db == nil {
+		return nil, nil
+	}
+	var out []MemberInfo
+	err := p.db.WithContext(ctx).Table("sundynix_tenant_member m").
+		Select("m.user_id, u.email, u.name, m.role, m.status, m.created_at as joined_at").
+		Joins("JOIN sundynix_user u ON u.id = m.user_id").
+		Where("m.tenant_id = ? AND m.status <> ?", tenantID, "removed").
+		Order("m.created_at asc").Scan(&out).Error
+	return out, err
+}
+
+// AddMemberByEmail 按邮箱把已注册用户加入租户（幂等：已在则改其角色并置 active，含"复活"已移除者）。
+// 用户不存在返回错误（本阶段不做外发邀请邮件，须对方先注册）。
+func (p *Postgres) AddMemberByEmail(ctx context.Context, tenantID, email, role string) (*MemberInfo, error) {
+	if p.db == nil {
+		return nil, errStoreDisabled
+	}
+	if !ValidRole(role) {
+		return nil, errors.New("非法角色")
+	}
+	// 注册时邮箱按小写存，这里也归一化，避免大小写导致查不到。
+	u, err := p.GetUserByEmail(ctx, strings.ToLower(strings.TrimSpace(email)))
+	if errors.Is(err, gorm.ErrRecordNotFound) || u == nil {
+		return nil, errors.New("该邮箱尚未注册，请对方先注册后再加入")
+	}
+	if err != nil {
+		return nil, err
+	}
+	if err := p.db.WithContext(ctx).Clauses(clause.OnConflict{
+		Columns:   []clause.Column{{Name: "tenant_id"}, {Name: "user_id"}},
+		DoUpdates: clause.Assignments(map[string]any{"role": role, "status": "active", "updated_at": time.Now()}),
+	}).Create(&TenantMember{TenantID: tenantID, UserID: u.ID, Role: role, Status: "active"}).Error; err != nil {
+		return nil, err
+	}
+	return &MemberInfo{UserID: u.ID, Email: u.Email, Name: u.Name, Role: role, Status: "active"}, nil
+}
+
+// SetMemberRole 改成员角色。不允许把 owner 降级（须先转让 owner，超出本阶段）。
+func (p *Postgres) SetMemberRole(ctx context.Context, tenantID, userID, role string) error {
+	if p.db == nil {
+		return errStoreDisabled
+	}
+	if !ValidRole(role) {
+		return errors.New("非法角色")
+	}
+	if p.MemberRole(ctx, tenantID, userID) == RoleOwner {
+		return errors.New("不能改 owner 的角色")
+	}
+	if role == RoleOwner {
+		return errors.New("不能直接授予 owner（须转让）")
+	}
+	return p.db.WithContext(ctx).Model(&TenantMember{}).
+		Where("tenant_id = ? AND user_id = ?", tenantID, userID).Update("role", role).Error
+}
+
+// RemoveMember 软移除成员（status=removed）。不能移除 owner。
+func (p *Postgres) RemoveMember(ctx context.Context, tenantID, userID string) error {
+	if p.db == nil {
+		return errStoreDisabled
+	}
+	if p.MemberRole(ctx, tenantID, userID) == RoleOwner {
+		return errors.New("不能移除 owner")
+	}
+	return p.db.WithContext(ctx).Model(&TenantMember{}).
+		Where("tenant_id = ? AND user_id = ?", tenantID, userID).Update("status", "removed").Error
+}
+
+// TenantInfo 是管理端租户目录一行（含成员数 + 余额）。
+type TenantInfo struct {
+	ID                 string `json:"id"`
+	Name               string `json:"name"`
+	Slug               string `json:"slug"`
+	Plan               string `json:"plan"`
+	Status             string `json:"status"`
+	CreditBalanceMicro int64  `json:"credit_balance_micro"`
+	Members            int64  `json:"members"`
+}
+
+// ListTenants 返回全部租户（管理端目录：含 active 成员数 + 积分余额）。
+func (p *Postgres) ListTenants(ctx context.Context) ([]TenantInfo, error) {
+	if p.db == nil {
+		return nil, nil
+	}
+	var out []TenantInfo
+	err := p.db.WithContext(ctx).Table("sundynix_tenant t").
+		Select("t.id, t.name, t.slug, t.plan, t.status, t.credit_balance_micro, "+
+			"(SELECT count(*) FROM sundynix_tenant_member m WHERE m.tenant_id = t.id AND m.status = 'active') as members").
+		Where("t.deleted_at IS NULL").Order("t.created_at asc").Scan(&out).Error
+	return out, err
+}
+
+// MyTenants 返回某用户所属（active）的全部租户（供多租户切换）。
+func (p *Postgres) MyTenants(ctx context.Context, userID string) ([]TenantInfo, error) {
+	if p.db == nil {
+		return nil, nil
+	}
+	var out []TenantInfo
+	err := p.db.WithContext(ctx).Table("sundynix_tenant t").
+		Select("t.id, t.name, t.slug, t.plan, t.status, t.credit_balance_micro, "+
+			"(SELECT count(*) FROM sundynix_tenant_member m2 WHERE m2.tenant_id = t.id AND m2.status = 'active') as members").
+		Joins("JOIN sundynix_tenant_member m ON m.tenant_id = t.id").
+		Where("m.user_id = ? AND m.status = 'active' AND t.deleted_at IS NULL", userID).
+		Order("t.created_at asc").Scan(&out).Error
+	return out, err
+}