diff --git a/pkg/kube_resource/generator/generator.go b/pkg/kube_resource/generator/generator.go
index 52d21ce..e1789d6 100644
--- a/pkg/kube_resource/generator/generator.go
+++ b/pkg/kube_resource/generator/generator.go
@@ -15,10 +15,10 @@
 package generator
 
 import (
+	"bytes"
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -57,7 +57,7 @@ func GetSpec(opts *GenOpts) (string, error) {
 	if err != nil {
 		return "", fmt.Errorf("could not locate spec: %s, err: %s", opts.Spec, err)
 	}
-	crdContent, err := ioutil.ReadFile(path)
+	crdContent, err := os.ReadFile(path)
 	if err != nil {
 		return "", fmt.Errorf("could not load spec: %s, err: %s", opts.Spec, err)
 	}
@@ -72,9 +72,12 @@ func GetSpec(opts *GenOpts) (string, error) {
 		return "", fmt.Errorf("could not validate swagger spec: %s, err: %s", opts.Spec, err)
 	}
 	tmpSpecDir := os.TempDir()
-	tmpFile, err := ioutil.TempFile(tmpSpecDir, "kcl-swagger-")
+	tmpFile, err := os.CreateTemp(tmpSpecDir, "kcl-swagger-")
+	if err != nil {
+		return "", fmt.Errorf("could not validate swagger spec: %s, err: %s", opts.Spec, err)
+	}
 	// copy k8s.json to tmpDir
-	if err := ioutil.WriteFile(filepath.Join(tmpSpecDir, "k8s.json"), []byte(k8sFile), 0644); err != nil {
+	if err := os.WriteFile(filepath.Join(tmpSpecDir, "k8s.json"), []byte(k8sFile), 0644); err != nil {
 		return "", fmt.Errorf("could not generate swagger spec file: %s, err: %s", opts.Spec, err)
 	}
 	if _, err := tmpFile.Write(swaggerContent); err != nil {
@@ -84,6 +87,62 @@ func GetSpec(opts *GenOpts) (string, error) {
 	return tmpFile.Name(), nil
 }
 
+// GetSpecs retrieves specifications from the given GenOpts and returns a list of temporary file paths for the generated OpenAPI specs.
+// It returns an error if there is any issue in fetching and generating the specs.
+// Parameters:
+// - opts: a GenOpts struct that contains the options and parameters required for generating the specs
+// Returns:
+// - []string: a list of temporary file paths for the generated OpenAPI specs
+// - error: an error message if any error occurs.
+func GetSpecs(opts *GenOpts) ([]string, error) {
+	var result []string
+	// read crd content from file
+	path, err := filepath.Abs(opts.Spec)
+	if err != nil {
+		return result, fmt.Errorf("could not locate spec: %s, err: %s", opts.Spec, err)
+	}
+	crdContent, err := os.ReadFile(path)
+	if err != nil {
+		return result, fmt.Errorf("could not load spec: %s, err: %s", opts.Spec, err)
+	}
+	contents := separateSubDocuments(crdContent)
+	for _, content := range contents {
+		// generate openapi spec from crd
+		swagger, err := generate(string(content))
+		if err != nil {
+			return result, fmt.Errorf("could not generate swagger spec: %s, err: %s", opts.Spec, err)
+		}
+		// write openapi spec to tmp file, along with the referenced k8s.json
+		swaggerContent, err := json.MarshalIndent(swagger, "", "")
+		if err != nil {
+			return result, fmt.Errorf("could not validate swagger spec: %s, err: %s", opts.Spec, err)
+		}
+		tmpSpecDir := os.TempDir()
+		tmpFile, err := os.CreateTemp(tmpSpecDir, "kcl-swagger-")
+		if err != nil {
+			return result, fmt.Errorf("could not validate swagger spec: %s, err: %s", opts.Spec, err)
+		}
+		// copy k8s.json to tmpDir
+		if err := os.WriteFile(filepath.Join(tmpSpecDir, "k8s.json"), []byte(k8sFile), 0644); err != nil {
+			return result, fmt.Errorf("could not generate swagger spec file: %s, err: %s", opts.Spec, err)
+		}
+		if _, err := tmpFile.Write(swaggerContent); err != nil {
+			return result, fmt.Errorf("could not generate swagger spec file: %s, err: %s", opts.Spec, err)
+		}
+		// Append the tmp openapi spec file path
+		result = append(result, tmpFile.Name())
+	}
+	return result, nil
+}
+
+func separateSubDocuments(data []byte) [][]byte {
+	lineBreak := "\n"
+	if bytes.Contains(data, []byte("\r\n---\r\n")) {
+		lineBreak = "\r\n"
+	}
+	return bytes.Split(data, []byte(lineBreak+"---"+lineBreak))
+}
+
 // generate swagger model based on crd
 func generate(crdYaml string) (*spec.Swagger, error) {
 	crdObj, _, err := scheme.Codecs.UniversalDeserializer().
diff --git a/pkg/kube_resource/generator/generator_test.go b/pkg/kube_resource/generator/generator_test.go
index 387f9c9..663bbb4 100644
--- a/pkg/kube_resource/generator/generator_test.go
+++ b/pkg/kube_resource/generator/generator_test.go
@@ -8,15 +8,6 @@ import (
 	"k8s.io/client-go/kubernetes/scheme"
 )
 
-func TestGenerate(t *testing.T) {
-	swagger, err := generate(workload)
-	if err != nil {
-		t.Fatalf("error: %v", err)
-	}
-	data, err := json.MarshalIndent(swagger, "", "  ")
-	fmt.Println(string(data))
-}
-
 const (
 	workload = `
 ---
@@ -527,10 +518,7 @@ status:
   conditions: []
   storedVersions: []
 `
-)
-
-func TestCrdObj2CrdInternal(t *testing.T) {
-	v1Crd := `
+	v1Crd = `
 ---
 apiVersion: apiextensions.k8s.io/v1
 kind: CustomResourceDefinition
@@ -564,7 +552,7 @@ spec:
     shortNames:
       - ct
 `
-	v1beta1Crd := `
+	v1beta1Crd = `
 ---
 # Deprecated in v1.16 in favor of apiextensions.k8s.io/v1
 apiVersion: apiextensions.k8s.io/v1beta1
@@ -609,6 +597,9 @@ spec:
       - ct
   preserveUnknownFields: false
 `
+)
+
+func TestCrdObj2CrdInternal(t *testing.T) {
 	crds := []string{v1Crd, v1beta1Crd}
 	for _, crdYaml := range crds {
 		crdObj, _, _ := scheme.Codecs.UniversalDeserializer().
@@ -619,3 +610,23 @@ spec:
 		}
 	}
 }
+
+func TestGenerate(t *testing.T) {
+	swagger, err := generate(workload)
+	if err != nil {
+		t.Fatalf("error: %v", err)
+	}
+	data, err := json.MarshalIndent(swagger, "", "  ")
+	if err != nil {
+		t.Errorf("generate failed. err: %s", err)
+	}
+	fmt.Println(string(data))
+}
+
+func TestSeparateSubDocuments(t *testing.T) {
+	crds := v1Crd + v1beta1Crd
+	files := separateSubDocuments([]byte(crds))
+	if len(files) != 3 {
+		t.Errorf("separateSubDocuments failed. expected 3, got %d", len(files))
+	}
+}