diff --git a/alicloud/data_source_alicloud_ssl_certificates_service_certificates.go b/alicloud/data_source_alicloud_ssl_certificates_service_certificates.go
index 89e1437bd2a9..f23c15d75c02 100644
--- a/alicloud/data_source_alicloud_ssl_certificates_service_certificates.go
+++ b/alicloud/data_source_alicloud_ssl_certificates_service_certificates.go
@@ -6,7 +6,6 @@ import (
 	"time"
 
 	"github.com/PaesslerAG/jsonpath"
-	util "github.com/alibabacloud-go/tea-utils/service"
 	"github.com/aliyun/terraform-provider-alicloud/alicloud/connectivity"
 	"github.com/hashicorp/terraform-plugin-sdk/helper/resource"
 	"github.com/hashicorp/terraform-plugin-sdk/helper/schema"
@@ -173,17 +172,11 @@ func dataSourceAliCloudSslCertificatesServiceCertificatesRead(d *schema.Resource
 	}
 
 	var response map[string]interface{}
-	conn, err := client.NewCasClient()
-	if err != nil {
-		return WrapError(err)
-	}
-
+	var err error
 	for {
-		runtime := util.RuntimeOptions{}
-		runtime.SetAutoretry(true)
 		wait := incrementalWait(3*time.Second, 3*time.Second)
 		err = resource.Retry(5*time.Minute, func() *resource.RetryError {
-			response, err = conn.DoRequest(StringPointer(action), nil, StringPointer("POST"), StringPointer("2020-04-07"), StringPointer("AK"), nil, request, &runtime)
+			response, err = client.RpcPost("cas", "2020-04-07", action, nil, request, true)
 			if err != nil {
 				if NeedRetry(err) {
 					wait()
diff --git a/alicloud/data_source_alicloud_ssl_certificates_service_certificates_test.go b/alicloud/data_source_alicloud_ssl_certificates_service_certificates_test.go
index abd604007c88..a587580f4010 100644
--- a/alicloud/data_source_alicloud_ssl_certificates_service_certificates_test.go
+++ b/alicloud/data_source_alicloud_ssl_certificates_service_certificates_test.go
@@ -210,42 +210,56 @@ func dataSourceAliCloudSslCertificatesConfig(name string) string {
   		certificate_name = var.name
   		cert             = <<EOF
 -----BEGIN CERTIFICATE-----
-MIIDRjCCAq+gAwIBAgIJAJn3ox4K13PoMA0GCSqGSIb3DQEBBQUAMHYxCzAJBgNV
-BAYTAkNOMQswCQYDVQQIEwJCSjELMAkGA1UEBxMCQkoxDDAKBgNVBAoTA0FMSTEP
-MA0GA1UECxMGQUxJWVVOMQ0wCwYDVQQDEwR0ZXN0MR8wHQYJKoZIhvcNAQkBFhB0
-ZXN0QGhvdG1haWwuY29tMB4XDTE0MTEyNDA2MDQyNVoXDTI0MTEyMTA2MDQyNVow
-djELMAkGA1UEBhMCQ04xCzAJBgNVBAgTAkJKMQswCQYDVQQHEwJCSjEMMAoGA1UE
-ChMDQUxJMQ8wDQYDVQQLEwZBTElZVU4xDTALBgNVBAMTBHRlc3QxHzAdBgkqhkiG
-9w0BCQEWEHRlc3RAaG90bWFpbC5jb20wgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJ
-AoGBAM7SS3e9+Nj0HKAsRuIDNSsS3UK6b+62YQb2uuhKrp1HMrOx61WSDR2qkAnB
-coG00Uz38EE+9DLYNUVQBK7aSgLP5M1Ak4wr4GqGyCgjejzzh3DshUzLCCy2rook
-KOyRTlPX+Q5l7rE1fcSNzgepcae5i2sE1XXXzLRIDIvQxcspAgMBAAGjgdswgdgw
-HQYDVR0OBBYEFBdy+OuMsvbkV7R14f0OyoLoh2z4MIGoBgNVHSMEgaAwgZ2AFBdy
-+OuMsvbkV7R14f0OyoLoh2z4oXqkeDB2MQswCQYDVQQGEwJDTjELMAkGA1UECBMC
-QkoxCzAJBgNVBAcTAkJKMQwwCgYDVQQKEwNBTEkxDzANBgNVBAsTBkFMSVlVTjEN
-MAsGA1UEAxMEdGVzdDEfMB0GCSqGSIb3DQEJARYQdGVzdEBob3RtYWlsLmNvbYIJ
-AJn3ox4K13PoMAwGA1UdEwQFMAMBAf8wDQYJKoZIhvcNAQEFBQADgYEAY7KOsnyT
-cQzfhiiG7ASjiPakw5wXoycHt5GCvLG5htp2TKVzgv9QTliA3gtfv6oV4zRZx7X1
-Ofi6hVgErtHaXJheuPVeW6eAW8mHBoEfvDAfU3y9waYrtUevSl07643bzKL6v+Qd
-DUBTxOAvSYfXTtI90EAxEG/bJJyOm5LqoiA=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 -----END CERTIFICATE-----
 EOF
   		key              = <<EOF
------BEGIN RSA PRIVATE KEY-----
-MIICXAIBAAKBgQDO0kt3vfjY9BygLEbiAzUrEt1Cum/utmEG9rroSq6dRzKzsetV
-kg0dqpAJwXKBtNFM9/BBPvQy2DVFUASu2koCz+TNQJOMK+BqhsgoI3o884dw7IVM
-ywgstq6KJCjskU5T1/kOZe6xNX3Ejc4HqXGnuYtrBNV118y0SAyL0MXLKQIDAQAB
-AoGAfe3NxbsGKhN42o4bGsKZPQDfeCHMxayGp5bTd10BtQIE/ST4BcJH+ihAS7Bd
-6FwQlKzivNd4GP1MckemklCXfsVckdL94e8ZbJl23GdWul3v8V+KndJHqv5zVJmP
-hwWoKimwIBTb2s0ctVryr2f18N4hhyFw1yGp0VxclGHkjgECQQD9CvllsnOwHpP4
-MdrDHbdb29QrobKyKW8pPcDd+sth+kP6Y8MnCVuAKXCKj5FeIsgVtfluPOsZjPzz
-71QQWS1dAkEA0T0KXO8gaBQwJhIoo/w6hy5JGZnrNSpOPp5xvJuMAafs2eyvmhJm
-Ev9SN/Pf2VYa1z6FEnBaLOVD6hf6YQIsPQJAX/CZPoW6dzwgvimo1/GcY6eleiWE
-qygqjWhsh71e/3bz7yuEAnj5yE3t7Zshcp+dXR3xxGo0eSuLfLFxHgGxwQJAAxf8
-9DzQ5NkPkTCJi0sqbl8/03IUKTgT6hcbpWdDXa7m8J3wRr3o5nUB+TPQ5nzAbthM
-zWX931YQeACcwhxvHQJBAN5mTzzJD4w4Ma6YTaNHyXakdYfyAWrOkPIWZxfhMfXe
-DrlNdiysTI4Dd1dLeErVpjsckAaOW/JDG5PCSwkaMxk=
------END RSA PRIVATE KEY-----
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----
 EOF
 	}
 `, name)
diff --git a/alicloud/resource_alicloud_ssl_certificates_service_certificate.go b/alicloud/resource_alicloud_ssl_certificates_service_certificate.go
index d436630ea523..d4a233857841 100644
--- a/alicloud/resource_alicloud_ssl_certificates_service_certificate.go
+++ b/alicloud/resource_alicloud_ssl_certificates_service_certificate.go
@@ -5,7 +5,6 @@ import (
 	"log"
 	"time"
 
-	util "github.com/alibabacloud-go/tea-utils/service"
 	"github.com/aliyun/terraform-provider-alicloud/alicloud/connectivity"
 	"github.com/hashicorp/terraform-plugin-sdk/helper/resource"
 	"github.com/hashicorp/terraform-plugin-sdk/helper/schema"
@@ -56,13 +55,9 @@ func resourceAliCloudSslCertificatesServiceCertificate() *schema.Resource {
 func resourceAliCloudSslCertificatesServiceCertificateCreate(d *schema.ResourceData, meta interface{}) error {
 	client := meta.(*connectivity.AliyunClient)
 	var response map[string]interface{}
+	var err error
 	action := "CreateUserCertificate"
 	request := make(map[string]interface{})
-	conn, err := client.NewCasClient()
-	if err != nil {
-		return WrapError(err)
-	}
-
 	request["Cert"] = d.Get("cert")
 	request["Key"] = d.Get("key")
 
@@ -78,11 +73,9 @@ func resourceAliCloudSslCertificatesServiceCertificateCreate(d *schema.ResourceD
 		request["Lang"] = v
 	}
 
-	runtime := util.RuntimeOptions{}
-	runtime.SetAutoretry(true)
 	wait := incrementalWait(3*time.Second, 3*time.Second)
 	err = resource.Retry(client.GetRetryTimeout(d.Timeout(schema.TimeoutCreate)), func() *resource.RetryError {
-		response, err = conn.DoRequest(StringPointer(action), nil, StringPointer("POST"), StringPointer("2018-07-13"), StringPointer("AK"), nil, request, &runtime)
+		response, err = client.RpcPost("cas", "2018-07-13", action, nil, request, false)
 		if err != nil {
 			if NeedRetry(err) {
 				wait()
@@ -135,12 +128,7 @@ func resourceAliCloudSslCertificatesServiceCertificateDelete(d *schema.ResourceD
 	casService := CasService{client}
 	action := "DeleteUserCertificate"
 	var response map[string]interface{}
-
-	conn, err := client.NewCasClient()
-	if err != nil {
-		return WrapError(err)
-	}
-
+	var err error
 	request := map[string]interface{}{
 		"CertId": d.Id(),
 	}
@@ -149,11 +137,9 @@ func resourceAliCloudSslCertificatesServiceCertificateDelete(d *schema.ResourceD
 		request["Lang"] = v
 	}
 
-	runtime := util.RuntimeOptions{}
-	runtime.SetAutoretry(true)
 	wait := incrementalWait(3*time.Second, 3*time.Second)
 	err = resource.Retry(client.GetRetryTimeout(d.Timeout(schema.TimeoutDelete)), func() *resource.RetryError {
-		response, err = conn.DoRequest(StringPointer(action), nil, StringPointer("POST"), StringPointer("2018-07-13"), StringPointer("AK"), nil, request, &runtime)
+		response, err = client.RpcPost("cas", "2018-07-13", action, nil, request, true)
 		if err != nil {
 			if NeedRetry(err) {
 				wait()
diff --git a/alicloud/resource_alicloud_ssl_certificates_service_certificate_test.go b/alicloud/resource_alicloud_ssl_certificates_service_certificate_test.go
index cc1cec233fe2..e9f586510849 100644
--- a/alicloud/resource_alicloud_ssl_certificates_service_certificate_test.go
+++ b/alicloud/resource_alicloud_ssl_certificates_service_certificate_test.go
@@ -8,8 +8,6 @@ import (
 	"time"
 
 	"github.com/PaesslerAG/jsonpath"
-	util "github.com/alibabacloud-go/tea-utils/service"
-
 	"github.com/aliyun/terraform-provider-alicloud/alicloud/connectivity"
 	"github.com/hashicorp/terraform-plugin-sdk/helper/acctest"
 	"github.com/hashicorp/terraform-plugin-sdk/helper/resource"
@@ -39,16 +37,10 @@ func testSweepSslCertificatesServiceCertificate(region string) error {
 	request["CurrentPage"] = 1
 	ids := make([]string, 0)
 	var response map[string]interface{}
-	conn, err := client.NewCasClient()
-	if err != nil {
-		return WrapError(err)
-	}
 	for {
-		runtime := util.RuntimeOptions{}
-		runtime.SetAutoretry(true)
 		wait := incrementalWait(3*time.Second, 3*time.Second)
 		err = resource.Retry(5*time.Minute, func() *resource.RetryError {
-			response, err = conn.DoRequest(StringPointer(action), nil, StringPointer("POST"), StringPointer("2018-07-13"), StringPointer("AK"), nil, request, &runtime)
+			response, err = client.RpcPost("cas", "2018-07-13", action, nil, request, true)
 			if err != nil {
 				if NeedRetry(err) {
 					wait()
@@ -97,7 +89,7 @@ func testSweepSslCertificatesServiceCertificate(region string) error {
 		}
 		wait := incrementalWait(3*time.Second, 3*time.Second)
 		err = resource.Retry(1*time.Minute, func() *resource.RetryError {
-			response, err = conn.DoRequest(StringPointer(action), nil, StringPointer("POST"), StringPointer("2018-07-13"), StringPointer("AK"), nil, request, &util.RuntimeOptions{})
+			response, err = client.RpcPost("cas", "2018-07-13", action, nil, request, false)
 			if err != nil {
 				if NeedRetry(err) {
 					wait()
@@ -302,60 +294,59 @@ func AliCloudSslCertificatesServiceCertificateBasicDependence0(name string) stri
 	variable "cert" {
   		default = <<EOF
 -----BEGIN CERTIFICATE-----
-MIID1zCCAr+gAwIBAgIRAOrWWz1qmkcSg90JDHjuzFwwDQYJKoZIhvcNAQELBQAw
-XjELMAkGA1UEBhMCQ04xDjAMBgNVBAoTBU15U1NMMSswKQYDVQQLEyJNeVNTTCBU
-ZXN0IFJTQSAtIEZvciB0ZXN0IHVzZSBvbmx5MRIwEAYDVQQDEwlNeVNTTC5jb20w
-HhcNMjQxMTI2MDczNjA4WhcNMjkxMTI1MDczNjA4WjAgMQswCQYDVQQGEwJDTjER
-MA8GA1UEAxMIdGVzdC5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIB
-AQDa7HDGbQ1Km0f4ZaFzYbjVN0q8KkvZ+oQUd4naGOZnlH5k0XFwmjg+TWf88YX3
-5IF8c45/rXrTWucPLg7FeqR96Wq9HZEmzEhs6VG031V9Hqa32saRScCOAyhiW7Hj
-OWf6BZveuxbZNbgQCR59QzX4CeAIC68xavIDAy3wcTAH9cIkD71BxEPJGGR7BIVH
-9DcWXaMAnJqQfrkth0xHBjflZABHAI0wPYPfaw8fd9DRkMYOIkfjwrrcL5IvhI1u
-D3wdHJQWA2vR8hjoU4dHiJLbUtQ+xV1UGVkF67CpQ6LDjSQdX7xlZ7WJMc/7dCJ9
-a7tr0ZTwq4/3KSgcRvm62oGvAgMBAAGjgc0wgcowDgYDVR0PAQH/BAQDAgWgMB0G
-A1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjAfBgNVHSMEGDAWgBQogSYF0TQa
-P8FzD7uTzxUcPwO/fzBjBggrBgEFBQcBAQRXMFUwIQYIKwYBBQUHMAGGFWh0dHA6
-Ly9vY3NwLm15c3NsLmNvbTAwBggrBgEFBQcwAoYkaHR0cDovL2NhLm15c3NsLmNv
-bS9teXNzbHRlc3Ryc2EuY3J0MBMGA1UdEQQMMAqCCHRlc3QuY29tMA0GCSqGSIb3
-DQEBCwUAA4IBAQAxPOlK5WBA9kITzxYyjqe/YvWzfMlsmj0yvpyHrPeZf7HZTTFz
-ebYkzrHL8ZLyOHBhag0nL7Poj6ek98NoXTuCYCi8LspdadapOeYQzLce3beu/frk
-sqU0A6WLHG9Ol9yUDMCX7xvLoAY/LDrcOM3Z87C/u/ykB4wKfFN2XfR3EZx3PQqw
-sV77LOnyQixB4FMHpHlKuDoUkSN9uvxwEPOeGnLZXm96hPsjPwk1bDM8qerNPpVI
-CwJ6kNuZ2eLz2Umqu2Gh3l4aADdIwxRY1OOjjZNut8STosABKWVGIwQbbAdRPQze
-qHZ05oVTjFy9L1DAzhQ5Zn3oUjLl5KW4tYBA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 -----END CERTIFICATE-----
 EOF
 	}
 
 	variable "key" {
   		default = <<EOF
------BEGIN RSA PRIVATE KEY-----
-MIIEpAIBAAKCAQEA2uxwxm0NSptH+GWhc2G41TdKvCpL2fqEFHeJ2hjmZ5R+ZNFx
-cJo4Pk1n/PGF9+SBfHOOf61601rnDy4OxXqkfelqvR2RJsxIbOlRtN9VfR6mt9rG
-kUnAjgMoYlux4zln+gWb3rsW2TW4EAkefUM1+AngCAuvMWryAwMt8HEwB/XCJA+9
-QcRDyRhkewSFR/Q3Fl2jAJyakH65LYdMRwY35WQARwCNMD2D32sPH3fQ0ZDGDiJH
-48K63C+SL4SNbg98HRyUFgNr0fIY6FOHR4iS21LUPsVdVBlZBeuwqUOiw40kHV+8
-ZWe1iTHP+3QifWu7a9GU8KuP9ykoHEb5utqBrwIDAQABAoIBAQCErEfIKOymKybZ
-pZXLnAxswt563FMtngGPecZEM1TmrvpOVROffwbY0wZTJ3fd/FBwwIM6Y0MNdYiU
-DYCMM0AewmeahqGh1qmJv3hx2eswMXQt9driz8RvDADcYt+SagbWYbHNsKovJrwO
-k8gzd5jsYeewWIxqsXpLUxDzJ1VJbIqoHgkrirRRPo0onpixPWeA0RbElSwjwIUw
-y43cC4WF8N7wot3cTST8yeKM8ujtqpN22ZtKnbkHTd03vnwQTMeUMJeDQmSmY5aJ
-yFr7yw/Z66+7Amh6pkWhzZSDHsjI4y/S3CCdpwFlMA7ID590umJB6HFxWsmVacSe
-MSs2vIJZAoGBAOiecPH1HVDQqH6PcrN/X9E3pDKSyAj+nHsVDGIZsie9f5g/qA0A
-tcJtQLS0CzrpMTLsAnsfdh2T7Lg6pYFz5jnOUyMjOImAEbCtgvqBxqgFea//OhdP
-8s/RmxKIAenBsk7Wbwx8/KPhbZLUNe8OnILVHDfS6kLSa49Iu+4UvrpNAoGBAPDt
-mky5MMHKdHwbqxPo9jYrz1m3gqqIvv+VihO4t/DE6t2Zg43ctfFm1BVEDSwPjYs/
-YV69KfVrVRUnzMZVdtHZ/dBK784YTY0OujemoaIzMKFIL8tbJFldVv2IgB+IelTX
-e675hVdHjNUqZhHwccd8X6d/8icohZw62SNHb/HrAoGBAN1HSt1/c6Gau42Y212Q
-fw9ARLuvEQYtXaFfxmXTV7uh8axccXndAQmwb+r1kfE6PojYJQwGQ4+jVX1ynFnm
-bEz0zfUQ3gk+gJV2mK+/n7/ZZYZb3WCrtqimFUOtiVRZ40pHhV91zcX+/QK9R4je
-d1elbbBUvG9QRu0IHW0+4qfJAoGAOmlQvIM1l/ZOsXw/yO71KoMKnXTJYDERJYQK
-2ucw6VXEn39FjtJQ5jsI9jLugp0usvDl2YNBNfgUw7FHi1pTGWOhjqtsYmov+x/z
-8+QZUerZQnDu7X2mXWgs3AEJFxwOlJ09pllmg5ecRF4oKvdBjpzP0BtMCURgyFTY
-Kh56vIsCgYBMbneMvFY6PCESKIAXj16BF4lqYVXFqHVoxyfxIuVlAy3TMNwxvpbS
-yDETk05Ux9yNES0WyTb1SWVG1o1wXc0dnDXCwJqLC1tzJUNUSD1AYvktoNIFErcN
-gs3ercrzBTX5ezORPj9ErRAPrSq+V3z1Lge5Gl+EqgDvAfnknww75w==
------END RSA PRIVATE KEY-----
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----
 EOF
 	}
 `, name)
diff --git a/alicloud/service_alicloud_cas.go b/alicloud/service_alicloud_cas.go
index c0ead32472c8..aadfcc9a52df 100644
--- a/alicloud/service_alicloud_cas.go
+++ b/alicloud/service_alicloud_cas.go
@@ -7,7 +7,6 @@ import (
 	"github.com/hashicorp/terraform-plugin-sdk/helper/schema"
 
 	"github.com/PaesslerAG/jsonpath"
-	util "github.com/alibabacloud-go/tea-utils/service"
 	"github.com/aliyun/terraform-provider-alicloud/alicloud/connectivity"
 	"github.com/hashicorp/terraform-plugin-sdk/helper/resource"
 )
@@ -17,24 +16,17 @@ type CasService struct {
 }
 
 func (s *CasService) DescribeSslCertificatesServiceCertificate(id string) (object map[string]interface{}, err error) {
+	client := s.client
 	var response map[string]interface{}
 	action := "DescribeUserCertificateDetail"
-
-	conn, err := s.client.NewCasClient()
-	if err != nil {
-		return nil, WrapError(err)
-	}
-
 	request := map[string]interface{}{
 		"RegionId": s.client.RegionId,
 		"CertId":   id,
 	}
 
-	runtime := util.RuntimeOptions{}
-	runtime.SetAutoretry(true)
 	wait := incrementalWait(3*time.Second, 3*time.Second)
 	err = resource.Retry(5*time.Minute, func() *resource.RetryError {
-		response, err = conn.DoRequest(StringPointer(action), nil, StringPointer("POST"), StringPointer("2018-07-13"), StringPointer("AK"), nil, request, &runtime)
+		response, err = client.RpcPost("cas", "2018-07-13", action, nil, request, true)
 		if err != nil {
 			if NeedRetry(err) {
 				wait()