diff --git a/go.mod b/go.mod
index 5529e2f7..7aecdb6b 100644
--- a/go.mod
+++ b/go.mod
@@ -54,6 +54,7 @@ require (
 	golang.org/x/time v0.2.0 // indirect
 	golang.org/x/tools v0.3.0 // indirect
 	google.golang.org/genproto v0.0.0-20221118155620-16455021b5e6 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	lukechampine.com/blake3 v1.1.7 // indirect
diff --git a/go.sum b/go.sum
index 95b85802..599a465d 100644
--- a/go.sum
+++ b/go.sum
@@ -330,7 +330,7 @@ google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQ
 google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
 google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/proxy/shadowsocks_2022/config.go b/proxy/shadowsocks_2022/config.go
new file mode 100644
index 00000000..8a66406c
--- /dev/null
+++ b/proxy/shadowsocks_2022/config.go
@@ -0,0 +1,29 @@
+package shadowsocks_2022
+
+import (
+	"github.com/xtls/xray-core/common/protocol"
+)
+
+// MemoryAccount is an account type converted from Account.
+type MemoryAccount struct {
+	Key   string
+	Email string
+	Level int32
+}
+
+// AsAccount implements protocol.AsAccount.
+func (u *User) AsAccount() (protocol.Account, error) {
+	return &MemoryAccount{
+		Key:   u.GetKey(),
+		Email: u.GetEmail(),
+		Level: u.GetLevel(),
+	}, nil
+}
+
+// Equals implements protocol.Account.Equals().
+func (a *MemoryAccount) Equals(another protocol.Account) bool {
+	if account, ok := another.(*MemoryAccount); ok {
+		return a.Key == account.Key
+	}
+	return false
+}
diff --git a/proxy/shadowsocks_2022/inbound.go b/proxy/shadowsocks_2022/inbound.go
index 55bdda9f..52b0a798 100644
--- a/proxy/shadowsocks_2022/inbound.go
+++ b/proxy/shadowsocks_2022/inbound.go
@@ -11,6 +11,7 @@ import (
 	E "github.com/sagernet/sing/common/exceptions"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
+
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/log"
diff --git a/proxy/shadowsocks_2022/inbound_multi.go b/proxy/shadowsocks_2022/inbound_multi.go
index 8b130e60..b9a258f6 100644
--- a/proxy/shadowsocks_2022/inbound_multi.go
+++ b/proxy/shadowsocks_2022/inbound_multi.go
@@ -4,6 +4,8 @@ import (
 	"context"
 	"encoding/base64"
 	"strconv"
+	"strings"
+	"sync"
 
 	"github.com/sagernet/sing-shadowsocks/shadowaead_2022"
 	C "github.com/sagernet/sing/common"
@@ -13,6 +15,7 @@ import (
 	E "github.com/sagernet/sing/common/exceptions"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
+
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/log"
@@ -31,6 +34,7 @@ func init() {
 }
 
 type MultiUserInbound struct {
+	sync.Mutex
 	networks []net.Network
 	users    []*User
 	service  *shadowaead_2022.MultiService[int]
@@ -78,6 +82,73 @@ func NewMultiServer(ctx context.Context, config *MultiUserServerConfig) (*MultiU
 	return inbound, nil
 }
 
+// AddUser implements proxy.UserManager.AddUser().
+func (i *MultiUserInbound) AddUser(ctx context.Context, u *protocol.MemoryUser) error {
+	i.Lock()
+	defer i.Unlock()
+
+	account := u.Account.(*MemoryAccount)
+	if account.Email != "" {
+		for idx := range i.users {
+			if i.users[idx].Email == account.Email {
+				return newError("User ", account.Email, " already exists.")
+			}
+		}
+	}
+	i.users = append(i.users, &User{
+		Key:   account.Key,
+		Email: strings.ToLower(account.Email),
+		Level: account.Level,
+	})
+
+	// sync to multi service
+	// Considering implements shadowsocks2022 in xray-core may have better performance.
+	i.service.UpdateUsersWithPasswords(
+		C.MapIndexed(i.users, func(index int, it *User) int { return index }),
+		C.Map(i.users, func(it *User) string { return it.Key }),
+	)
+
+	return nil
+}
+
+// RemoveUser implements proxy.UserManager.RemoveUser().
+func (i *MultiUserInbound) RemoveUser(ctx context.Context, email string) error {
+	if email == "" {
+		return newError("Email must not be empty.")
+	}
+
+	i.Lock()
+	defer i.Unlock()
+
+	email = strings.ToLower(email)
+	idx := -1
+	for ii, u := range i.users {
+		if strings.EqualFold(u.Email, email) {
+			idx = ii
+			break
+		}
+	}
+
+	if idx == -1 {
+		return newError("User ", email, " not found.")
+	}
+
+	ulen := len(i.users)
+
+	i.users[idx] = i.users[ulen-1]
+	i.users[ulen-1] = nil
+	i.users = i.users[:ulen-1]
+
+	// sync to multi service
+	// Considering implements shadowsocks2022 in xray-core may have better performance.
+	i.service.UpdateUsersWithPasswords(
+		C.MapIndexed(i.users, func(index int, it *User) int { return index }),
+		C.Map(i.users, func(it *User) string { return it.Key }),
+	)
+
+	return nil
+}
+
 func (i *MultiUserInbound) Network() []net.Network {
 	return i.networks
 }