diff --git a/kclvm_test.go b/kclvm_test.go
index 808dcfef..442d4cbe 100644
--- a/kclvm_test.go
+++ b/kclvm_test.go
@@ -154,7 +154,8 @@ a2 = App {
 	result, err = kcl.Run(testdata_main_k,
 		kcl.WithCode(code),
 		kcl.WithOverrides(":a1.image=\"new-a1-image\""),
-		kcl.WithOverrides("__main__:a2.image=\"new-a2-image:v123\""),
+		kcl.WithOverrides("a2.image=\"new-a2-image:v123\""),
+		kcl.WithOverrides("a2.name-"),
 		kcl.WithPrintOverridesAST(true),
 	)
 	if err != nil {
@@ -167,6 +168,9 @@ a2 = App {
 	if expect, got := "new-a2-image:v123", result.First().Get("a2.image"); expect != got {
 		t.Fatalf("expect = %v, got = %v", expect, got)
 	}
+	if expect, got := "app", result.First().Get("a2.name"); expect != got {
+		t.Fatalf("expect = %v, got = %v", expect, got)
+	}
 
 	data, err := os.ReadFile(testdata_main_k)
 	if err != nil {
@@ -183,10 +187,7 @@ a1 = App {
     image = "new-a1-image"
 }
 
-a2 = App {
-    image = "new-a2-image:v123"
-    name = "a2-app"
-}`)
+a2 = App {image = "new-a2-image:v123"}`)
 
 	got := strings.TrimSpace(string(data))
 	got = strings.ReplaceAll(got, "\r\n", "\n")
diff --git a/pkg/kcl/opt.go b/pkg/kcl/opt.go
index 00eb77c9..089fa733 100644
--- a/pkg/kcl/opt.go
+++ b/pkg/kcl/opt.go
@@ -11,6 +11,7 @@ import (
 
 	"kcl-lang.io/kcl-go/pkg/settings"
 	"kcl-lang.io/kcl-go/pkg/spec/gpyrpc"
+	"kcl-lang.io/kcl-go/pkg/tools/override"
 )
 
 type Option struct {
@@ -125,30 +126,34 @@ func WithOptions(key_value_list ...string) Option {
 }
 
 // kcl -O pkgpath:path.to.field=field_value
+// kcl -O pkgpath.path.to.field-
 func WithOverrides(override_list ...string) Option {
 	var overrides []*gpyrpc.CmdOverrideSpec
-	for _, kv := range override_list {
-		idx0 := strings.Index(kv, ":")
-		if idx0 < 0 {
-			idx0 = 0
-		}
-		idx1 := strings.Index(kv, "=")
-		if idx0 >= 0 && idx1 >= 0 && idx0 < idx1 {
-			var pkgpath = kv[:idx0]
-			var field_path = kv[idx0+1 : idx1]
-			var field_value = kv[idx1+1:]
-			overrides = append(overrides, &gpyrpc.CmdOverrideSpec{
-				Pkgpath:    pkgpath,
-				FieldPath:  field_path,
-				FieldValue: field_value,
-			})
-		}
+	for _, spec := range override_list {
+		o, _ := override.ParseOverrideSpec(spec)
+		overrides = append(overrides, o)
 	}
 	var opt = NewOption()
 	opt.Overrides = overrides
 	return *opt
 }
 
+// kcl -O pkgpath:path.to.field=field_value
+// kcl -O pkgpath.path.to.field-
+func WithOverridesError(override_list ...string) (Option, error) {
+	var overrides []*gpyrpc.CmdOverrideSpec
+	var opt = NewOption()
+	for _, spec := range override_list {
+		o, err := override.ParseOverrideSpec(spec)
+		if err != nil {
+			return *opt, err
+		}
+		overrides = append(overrides, o)
+	}
+	opt.Overrides = overrides
+	return *opt, nil
+}
+
 // kcl -S path.to.field
 func WithSelectors(selectors ...string) Option {
 	var opt = NewOption()
diff --git a/pkg/tools/override/override.go b/pkg/tools/override/override.go
index ca27f2fd..151f0da6 100644
--- a/pkg/tools/override/override.go
+++ b/pkg/tools/override/override.go
@@ -3,10 +3,19 @@
 package override
 
 import (
+	"errors"
+	"fmt"
+	"strings"
+
 	"kcl-lang.io/kcl-go/pkg/service"
 	"kcl-lang.io/kcl-go/pkg/spec/gpyrpc"
 )
 
+const (
+	DeleteAction         = "Delete"
+	CreateOrUpdateAction = "CreateOrUpdate"
+)
+
 func OverrideFile(file string, specs, importPaths []string) (result bool, err error) {
 	client := service.NewKclvmServiceClient()
 	resp, err := client.OverrideFile(&gpyrpc.OverrideFile_Args{
@@ -19,3 +28,69 @@ func OverrideFile(file string, specs, importPaths []string) (result bool, err er
 	}
 	return resp.Result, nil
 }
+
+func ParseOverrideSpec(spec string) (*gpyrpc.CmdOverrideSpec, error) {
+	if strings.Contains(spec, "=") {
+		// Create or update the override value.
+		splitValues := strings.SplitN(spec, "=", 2)
+		if len(splitValues) < 2 {
+			return nil, invalidSpecError(spec)
+		}
+		path := splitValues[0]
+		fieldValue := splitValues[1]
+		pkgpath, fieldPath, err := splitFieldPath(path)
+		if err != nil {
+			return nil, err
+		}
+		return &gpyrpc.CmdOverrideSpec{
+			Pkgpath:    pkgpath,
+			FieldPath:  fieldPath,
+			FieldValue: fieldValue,
+			Action:     CreateOrUpdateAction,
+		}, nil
+	} else if strippedSpec := strings.TrimSuffix(spec, "-"); strippedSpec != spec {
+		// Delete the override value.
+		pkgpath, fieldPath, err := splitFieldPath(strippedSpec)
+		if err != nil {
+			return nil, err
+		}
+		return &gpyrpc.CmdOverrideSpec{
+			Pkgpath:    pkgpath,
+			FieldPath:  fieldPath,
+			FieldValue: "",
+			Action:     DeleteAction,
+		}, nil
+	} else {
+		return nil, invalidSpecError(spec)
+	}
+}
+
+// Get field package path and identifier name from the path.
+//
+// split_field_path("pkg.to.path:field") -> ("pkg.to.path", "field")
+func splitFieldPath(path string) (string, string, error) {
+	err := errors.New("Invalid field path " + path)
+	paths := strings.SplitN(path, ":", 2)
+	if len(paths) == 1 {
+		pkgpath := ""
+		fieldPath := paths[0]
+		if fieldPath == "" {
+			return "", "", err
+		}
+		return pkgpath, fieldPath, nil
+	} else if len(paths) == 2 {
+		pkgpath := paths[0]
+		fieldPath := paths[1]
+		if fieldPath == "" {
+			return "", "", err
+		}
+		return pkgpath, fieldPath, nil
+	} else {
+		return "", "", err
+	}
+}
+
+// / Get the invalid spec error message.
+func invalidSpecError(spec string) error {
+	return fmt.Errorf("invalid spec format '%s', expected <pkgpath>:<field_path>=<filed_value> or <pkgpath>:<field_path>-", spec)
+}