diff --git a/pkg/cloudprovider/images.go b/pkg/cloudprovider/images.go
index 22b76f334c..ce139a2962 100644
--- a/pkg/cloudprovider/images.go
+++ b/pkg/cloudprovider/images.go
@@ -25,13 +25,13 @@ type SImage struct {
 	DiskFormat string
 	Id         string
 	IsPublic   bool
-	MinDisk    int
-	MinRam     int
+	MinDiskMB  int `json:"min_disk"`
+	MinRamMB   int `json:"min_ram"`
 	Name       string
 	Owner      string
 	Properties map[string]string
 	Protected  bool
-	Size       int64
+	SizeBytes  int64 `json:"size"`
 	Status     string
 	// UpdatedAt       time.Time
 }
@@ -43,8 +43,8 @@ func CloudImage2Image(image ICloudImage) SImage {
 		DiskFormat: image.GetImageFormat(),
 		Id:         image.GetId(),
 		IsPublic:   image.GetImageType() != CachedImageTypeCustomized,
-		MinDisk:    image.GetMinOsDiskSizeGb(),
-		MinRam:     0,
+		MinDiskMB:  image.GetMinOsDiskSizeGb() * 1024,
+		MinRamMB:   0,
 		Name:       image.GetName(),
 		Properties: map[string]string{
 			"os_type":         image.GetOsType(),
@@ -53,7 +53,7 @@ func CloudImage2Image(image ICloudImage) SImage {
 			"os_arch":         image.GetOsArch(),
 		},
 		Protected: true,
-		Size:      image.GetSize(),
+		SizeBytes: image.GetSize(),
 		Status:    image.GetImageStatus(),
 	}
 }
diff --git a/pkg/compute/models/disks.go b/pkg/compute/models/disks.go
index 98376eaefc..c5511fe401 100644
--- a/pkg/compute/models/disks.go
+++ b/pkg/compute/models/disks.go
@@ -1274,7 +1274,7 @@ func fillDiskConfigByImage(ctx context.Context, userCred mcclient.TokenCredentia
 		// diskConfig.ImageDiskFormat = image.DiskFormat
 		CachedimageManager.ImageAddRefCount(image.Id)
 		if diskConfig.SizeMb == 0 {
-			diskConfig.SizeMb = image.MinDisk * 1024 // MB
+			diskConfig.SizeMb = image.MinDiskMB // MB
 		}
 	}
 	return nil
diff --git a/pkg/image/models/images.go b/pkg/image/models/images.go
index 80f695d656..55347dad78 100644
--- a/pkg/image/models/images.go
+++ b/pkg/image/models/images.go
@@ -114,8 +114,8 @@ type SImage struct {
 	Checksum   string `width:"32" charset:"ascii" nullable:"true" get:"user" list:"user"`
 	FastHash   string `width:"32" charset:"ascii" nullable:"true" get:"user"`
 	Owner      string `width:"255" charset:"ascii" nullable:"true" get:"user"`
-	MinDisk    int32  `nullable:"false" default:"0" get:"user" create:"optional" update:"user"`
-	MinRam     int32  `nullable:"false" default:"0" get:"user" create:"optional" update:"user"`
+	MinDiskMB  int32  `name:"min_disk" nullable:"false" default:"0" get:"user" create:"optional" update:"user"`
+	MinRamMB   int32  `name:"min_ram" nullable:"false" default:"0" get:"user" create:"optional" update:"user"`
 	Protected  *bool  `nullable:"true" list:"user" get:"user" create:"optional" update:"user"`
 }
 
@@ -392,15 +392,14 @@ func (self *SImage) SaveImageFromStream(reader io.Reader) error {
 
 	sp, err := self.saveImageFromStream(localPath, reader)
 
-	virtualSize := int64(0)
+	virtualSizeBytes := int64(0)
 	format := ""
 	img, err := qemuimg.NewQemuImage(localPath)
 	if err != nil {
 		return err
-	} else {
-		format = string(img.Format)
-		virtualSize = img.SizeBytes
 	}
+	format = string(img.Format)
+	virtualSizeBytes = img.SizeBytes
 
 	fastChksum, err := fileutils2.FastCheckSum(localPath)
 	if err != nil {
@@ -415,8 +414,8 @@ func (self *SImage) SaveImageFromStream(reader io.Reader) error {
 		if len(format) > 0 {
 			self.DiskFormat = format
 		}
-		if virtualSize > 0 {
-			self.VirtualSize = virtualSize
+		if virtualSizeBytes > 0 {
+			self.MinDiskMB = int32(virtualSizeBytes / 1024 / 1024)
 		}
 		return nil
 	})
diff --git a/pkg/util/openstack/image.go b/pkg/util/openstack/image.go
index ade44b6e59..d5dd500862 100644
--- a/pkg/util/openstack/image.go
+++ b/pkg/util/openstack/image.go
@@ -161,7 +161,7 @@ func (image *SImage) GetOsArch() string {
 }
 
 func (image *SImage) GetMinOsDiskSizeGb() int {
-	return 50
+	return image.MinDisk
 }
 
 func (image *SImage) GetImageFormat() string {