diff --git a/internal/db/models/user_bill_dao.go b/internal/db/models/user_bill_dao.go
index 0395eb85..31fc6201 100644
--- a/internal/db/models/user_bill_dao.go
+++ b/internal/db/models/user_bill_dao.go
@@ -68,6 +68,17 @@ func init() {
 	})
 }
 
+// FindUserBill 查找单个账单
+func (this *UserBillDAO) FindUserBill(tx *dbs.Tx, billId int64) (*UserBill, error) {
+	one, err := this.Query(tx).
+		Pk(billId).
+		Find()
+	if err != nil || one == nil {
+		return nil, err
+	}
+	return one.(*UserBill), nil
+}
+
 // CountAllUserBills 计算账单数量
 func (this *UserBillDAO) CountAllUserBills(tx *dbs.Tx, isPaid int32, userId int64, month string) (int64, error) {
 	query := this.Query(tx)
@@ -330,3 +341,33 @@ func (this *UserBillDAO) GenerateBillCode(tx *dbs.Tx) (string, error) {
 	}
 	return this.GenerateBillCode(tx)
 }
+
+// CheckUserBill 检查用户账单
+func (this *UserBillDAO) CheckUserBill(tx *dbs.Tx, userId int64, billId int64) error {
+	if userId <= 0 || billId <= 0 {
+		return ErrNotFound
+	}
+	exists, err := this.Query(tx).
+		Pk(billId).
+		Attr("userId", userId).
+		Exist()
+	if err != nil {
+		return err
+	}
+	if !exists {
+		return ErrNotFound
+	}
+	return nil
+}
+
+// SumUnpaidUserBill 计算某个用户未支付总额
+func (this *UserBillDAO) SumUnpaidUserBill(tx *dbs.Tx, userId int64) (float32, error) {
+	sum, err := this.Query(tx).
+		Attr("userId", userId).
+		Attr("isPaid", 0).
+		Sum("amount", 0)
+	if err != nil {
+		return 0, err
+	}
+	return float32(sum), nil
+}
diff --git a/internal/rpc/services/service_user_bill.go b/internal/rpc/services/service_user_bill.go
index 63e6b307..55c3a1db 100644
--- a/internal/rpc/services/service_user_bill.go
+++ b/internal/rpc/services/service_user_bill.go
@@ -3,8 +3,12 @@ package services
 import (
 	"context"
 	"github.com/TeaOSLab/EdgeAPI/internal/db/models"
+	"github.com/TeaOSLab/EdgeAPI/internal/db/models/accounts"
 	"github.com/TeaOSLab/EdgeAPI/internal/errors"
 	"github.com/TeaOSLab/EdgeCommon/pkg/rpc/pb"
+	"github.com/TeaOSLab/EdgeCommon/pkg/userconfigs"
+	"github.com/iwind/TeaGo/dbs"
+	"github.com/iwind/TeaGo/maps"
 	timeutil "github.com/iwind/TeaGo/utils/time"
 	"regexp"
 )
@@ -97,3 +101,142 @@ func (this *UserBillService) ListUserBills(ctx context.Context, req *pb.ListUser
 	}
 	return &pb.ListUserBillsResponse{UserBills: result}, nil
 }
+
+// FindUserBill 查找账单信息
+func (this *UserBillService) FindUserBill(ctx context.Context, req *pb.FindUserBillRequest) (*pb.FindUserBillResponse, error) {
+	_, userId, err := this.ValidateAdminAndUser(ctx, 0, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	var tx = this.NullTx()
+
+	// 检查用户
+	if userId > 0 {
+		err = models.SharedUserBillDAO.CheckUserBill(tx, userId, req.UserBillId)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	bill, err := models.SharedUserBillDAO.FindUserBill(tx, req.UserBillId)
+	if err != nil {
+		return nil, err
+	}
+
+	if bill == nil {
+		return &pb.FindUserBillResponse{UserBill: nil}, nil
+	}
+
+	// 用户
+	var pbUser = &pb.User{Id: int64(bill.UserId)}
+	user, err := models.SharedUserDAO.FindEnabledUser(tx, int64(bill.UserId), nil)
+	if err != nil {
+		return nil, err
+	}
+	if user != nil {
+		pbUser = &pb.User{
+			Id:       int64(user.Id),
+			Username: user.Username,
+			Fullname: user.Fullname,
+		}
+	}
+
+	return &pb.FindUserBillResponse{
+		UserBill: &pb.UserBill{
+			Id:          int64(bill.Id),
+			User:        pbUser,
+			Type:        bill.Type,
+			TypeName:    models.SharedUserBillDAO.BillTypeName(bill.Type),
+			Description: bill.Description,
+			Amount:      float32(bill.Amount),
+			Month:       bill.Month,
+			IsPaid:      bill.IsPaid == 1,
+			PaidAt:      int64(bill.PaidAt),
+			Code:        bill.Code,
+		},
+	}, nil
+}
+
+// PayUserBill 支付账单
+func (this *UserBillService) PayUserBill(ctx context.Context, req *pb.PayUserBillRequest) (*pb.RPCSuccess, error) {
+	_, userId, err := this.ValidateAdminAndUser(ctx, 0, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	err = this.RunTx(func(tx *dbs.Tx) error {
+		// 检查用户
+		if userId > 0 {
+			err = models.SharedUserBillDAO.CheckUserBill(tx, userId, req.UserBillId)
+			if err != nil {
+				return err
+			}
+		}
+
+		// 是否存在
+		bill, err := models.SharedUserBillDAO.FindUserBill(tx, req.UserBillId)
+		if err != nil {
+			return err
+		}
+		if bill == nil {
+			return nil
+		}
+		userId = int64(bill.UserId)
+
+		// 是否已支付
+		if bill.IsPaid == 1 {
+			return nil
+		}
+
+		if bill.Amount <= 0 {
+			// 直接修改为已支付
+			return models.SharedUserBillDAO.UpdateUserBillIsPaid(tx, req.UserBillId, true)
+		}
+
+		// 余额是否足够
+		account, err := accounts.SharedUserAccountDAO.FindUserAccountWithUserId(tx, userId)
+		if err != nil {
+			return err
+		}
+		if account == nil {
+			return errors.New("can not find user account")
+		}
+
+		if account.Total < bill.Amount {
+			return errors.New("not enough balance to pay")
+		}
+
+		err = accounts.SharedUserAccountDAO.UpdateUserAccount(tx, int64(account.Id), -float32(bill.Amount), userconfigs.AccountEventTypePayBill, "支付账单"+bill.Code, maps.Map{"billId": bill.Id})
+		if err != nil {
+			return err
+		}
+
+		// 修改为已支付
+		return models.SharedUserBillDAO.UpdateUserBillIsPaid(tx, req.UserBillId, true)
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return this.Success()
+}
+
+// SumUserUnpaidBills 计算用户所有未支付账单总额
+func (this *UserBillService) SumUserUnpaidBills(ctx context.Context, req *pb.SumUserUnpaidBillsRequest) (*pb.SumUserUnpaidBillsResponse, error) {
+	_, userId, err := this.ValidateAdminAndUser(ctx, 0, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	var tx = this.NullTx()
+	if userId > 0 {
+		req.UserId = userId
+	}
+
+	sum, err := models.SharedUserBillDAO.SumUnpaidUserBill(tx, userId)
+	if err != nil {
+		return nil, err
+	}
+	return &pb.SumUserUnpaidBillsResponse{Amount: sum}, nil
+}