diff --git a/pkg/compute/models/skus.go b/pkg/compute/models/skus.go
index f940aaff8b3..2cf98487a99 100644
--- a/pkg/compute/models/skus.go
+++ b/pkg/compute/models/skus.go
@@ -317,8 +317,8 @@ func (self *SServerSkuManager) ValidateCreateData(ctx context.Context, userCred
 		return input, httperrors.NewOutOfRangeError("cpu_core_count should be range of 1~256")
 	}
 
-	if input.MemorySizeMB < 512 || input.MemorySizeMB > 1024*512 {
-		return input, httperrors.NewOutOfRangeError("memory_size_mb, shoud be range of 512~%d", 1024*512)
+	if input.MemorySizeMB < 512 || input.MemorySizeMB > 1024*1024 {
+		return input, httperrors.NewOutOfRangeError("memory_size_mb, shoud be range of 512~%d", 1024*1024)
 	}
 
 	if len(input.InstanceTypeCategory) == 0 {
diff --git a/pkg/hostman/guestman/qemu/qemu.go b/pkg/hostman/guestman/qemu/qemu.go
index 465b373f04f..08c56d64e30 100644
--- a/pkg/hostman/guestman/qemu/qemu.go
+++ b/pkg/hostman/guestman/qemu/qemu.go
@@ -433,7 +433,11 @@ func (o baseOptions_x86_64) SMP(cpus uint) string {
 }
 
 func (o baseOptions_x86_64) Memory(sizeMB uint64) string {
-	return fmt.Sprintf("-m %dM,slots=4,maxmem=524288M", sizeMB)
+	maxMem := options.HostOptions.MaxMemorySizeMb
+	if maxMem == 0 {
+		maxMem = 524288
+	}
+	return fmt.Sprintf("-m %dM,slots=4,maxmem=%dM", sizeMB, maxMem)
 }
 
 func (o baseOptions_x86_64) Cdrom(cdromPath string, osName string, isQ35 bool, disksLen int) []string {
@@ -542,7 +546,11 @@ func (o baseOptions_aarch64) SMP(cpus uint) string {
 }
 
 func (o baseOptions_aarch64) Memory(sizeMB uint64) string {
-	return fmt.Sprintf("-m %dM,slots=4,maxmem=262144M", sizeMB)
+	maxMem := options.HostOptions.MaxMemorySizeMb
+	if maxMem == 0 {
+		maxMem = 262144
+	}
+	return fmt.Sprintf("-m %dM,slots=4,maxmem=%dM", sizeMB, maxMem)
 }
 
 func (o baseOptions_aarch64) Cdrom(cdromPath string, osName string, isQ35 bool, disksLen int) []string {
diff --git a/pkg/hostman/options/options.go b/pkg/hostman/options/options.go
index 43e6621b13a..9aa3675f537 100644
--- a/pkg/hostman/options/options.go
+++ b/pkg/hostman/options/options.go
@@ -31,7 +31,9 @@ type SHostBaseOptions struct {
 	HostCpuPassthrough        bool  `default:"true" help:"if it is true, set qemu cpu type as -cpu host, otherwise, qemu64. default is true"`
 	LiveMigrateCpuThrottleMax int64 `default:"99" help:"live migrate auto converge cpu throttle max"`
 
-	DefaultQemuVersion string `help:"Default qemu version" default:"4.2.0"`
+	DefaultQemuVersion  string `help:"Default qemu version" default:"4.2.0"`
+	MaxMemorySizeMb     int64  `help:"Max memory size mb"`
+	MaxHotplugVCpuCount int    `help:"maximal possible vCPU count that the platform kvm supports"`
 }
 
 type SHostOptions struct {
@@ -187,8 +189,6 @@ type SHostOptions struct {
 	LocalBackupTempPath    string `help:"the local temporary directory for backup" default:"/opt/cloud/workspace/run/backups"`
 
 	BinaryMemcleanPath string `help:"execute binary memclean path" default:"/opt/yunion/bin/memclean"`
-
-	MaxHotplugVCpuCount int `help:"maximal possible vCPU count that the platform kvm supports"`
 }
 
 var (