diff --git a/tencentcloud/resource_tc_instance.go b/tencentcloud/resource_tc_instance.go
index 26cafee65c..d75b5c6b58 100644
--- a/tencentcloud/resource_tc_instance.go
+++ b/tencentcloud/resource_tc_instance.go
@@ -229,7 +229,6 @@ func resourceTencentCloudInstance() *schema.Resource {
 			"instance_charge_type": {
 				Type:         schema.TypeString,
 				Optional:     true,
-				ForceNew:     true,
 				Default:      CVM_CHARGE_TYPE_POSTPAID,
 				ValidateFunc: validateAllowedStringValue(CVM_CHARGE_TYPE),
 				Description:  "The charge type of instance. Valid values are `PREPAID`, `POSTPAID_BY_HOUR`, `SPOTPAID` and `CDHPAID`. The default is `POSTPAID_BY_HOUR`. Note: TencentCloud International only supports `POSTPAID_BY_HOUR` and `CDHPAID`. `PREPAID` instance may not allow to delete before expired. `SPOTPAID` instance must set `spot_instance_type` and `spot_max_price` at the same time. `CDHPAID` instance must set `cdh_instance_type` and `cdh_host_id`.",
@@ -968,12 +967,53 @@ func resourceTencentCloudInstanceUpdate(d *schema.ResourceData, meta interface{}
 
 	d.Partial(true)
 
-	unsupportedUpdateFields := []string{
-		"instance_charge_type_prepaid_period",
+	if d.HasChange("instance_charge_type") {
+		old, chargeType := d.GetChange("instance_charge_type")
+		if old.(string) != CVM_CHARGE_TYPE_POSTPAID || chargeType.(string) != CVM_CHARGE_TYPE_PREPAID  {
+			return fmt.Errorf("Only support change chargeType from POSTPAID_BY_HOUR to PREPAID.")
+		}
+		var (
+			period    int
+			renewFlag string
+		)
+		if v, ok := d.GetOk("instance_charge_type_prepaid_period"); ok {
+			period = v.(int)
+		} else {
+			return fmt.Errorf("instance charge type prepaid period can not"+
+				" be empty when charge type is %s", chargeType)
+		}
+		if v, ok := d.GetOk("instance_charge_type_prepaid_renew_flag"); ok {
+			renewFlag = v.(string)
+		}
+		// change charge type
+		err := cvmService.ModifyInstanceChargeType(ctx, instanceId, chargeType.(string), period, renewFlag)
+		if err != nil {
+			return err
+		}
+		// query cvm status
+		err = resource.Retry(5*readRetryTimeout, func() *resource.RetryError {
+			instance, errRet := cvmService.DescribeInstanceById(ctx, instanceId)
+			if errRet != nil {
+				return retryError(errRet, InternalError)
+			}
+			if instance != nil && (*instance.InstanceState == CVM_STATUS_RUNNING ||
+				*instance.InstanceState == CVM_STATUS_LAUNCH_FAILED) {
+				return nil
+			}
+			return resource.RetryableError(fmt.Errorf("cvm instance status is %s, retry...", *instance.InstanceState))
+		})
+		if err != nil {
+			return err
+		}
 	}
-	for _, field := range unsupportedUpdateFields {
-		if d.HasChange(field) {
-			return fmt.Errorf("tencentcloud_cvm_instance update on %s is not support yet", field)
+
+	if d.HasChange("instance_charge_type_prepaid_period") {
+		chargeType := d.Get("instance_charge_type").(string)
+		if chargeType != CVM_CHARGE_TYPE_PREPAID {
+			return fmt.Errorf("tencentcloud_cvm_instance update on instance_charge_type_prepaid_period or instance_charge_type_prepaid_renew_flag is only supported with charge type PREPAID")
+		}
+		if !d.HasChange("instance_charge_type") {
+			return fmt.Errorf("tencentcloud_cvm_instance update on instance_charge_type_prepaid_period is only with charge type change to PREPAID")
 		}
 	}
 
diff --git a/tencentcloud/service_tencentcloud_cvm.go b/tencentcloud/service_tencentcloud_cvm.go
index 2972d1551e..9b19379506 100644
--- a/tencentcloud/service_tencentcloud_cvm.go
+++ b/tencentcloud/service_tencentcloud_cvm.go
@@ -1027,3 +1027,30 @@ func (me *CvmService) ModifyRenewParam(ctx context.Context, instanceId string, r
 
 	return nil
 }
+
+func (me *CvmService) ModifyInstanceChargeType(ctx context.Context, instanceId string, chargeType string, period int,
+	renewFlag string) error {
+	logId := getLogId(ctx)
+	request := cvm.NewModifyInstancesChargeTypeRequest()
+	request.InstanceIds = []*string{&instanceId}
+	request.InstanceChargeType = &chargeType
+	request.InstanceChargePrepaid = &cvm.InstanceChargePrepaid{}
+	if period != -1 {
+		request.InstanceChargePrepaid.Period = helper.IntInt64(period)
+	}
+	if renewFlag != "" {
+		request.InstanceChargePrepaid.RenewFlag = &renewFlag
+	}
+
+	ratelimit.Check(request.GetAction())
+	response, err := me.client.UseCvmClient().ModifyInstancesChargeType(request)
+	if err != nil {
+		log.Printf("[CRITAL]%s api[%s] fail, request body [%s], reason[%s]\n",
+			logId, request.GetAction(), request.ToJsonString(), err.Error())
+		return err
+	}
+	log.Printf("[DEBUG]%s api[%s] success, request body [%s], response body [%s]\n",
+		logId, request.GetAction(), request.ToJsonString(), response.ToJsonString())
+
+	return nil
+}
diff --git a/website/docs/r/instance.html.markdown b/website/docs/r/instance.html.markdown
index 280e71421d..ab90af155c 100644
--- a/website/docs/r/instance.html.markdown
+++ b/website/docs/r/instance.html.markdown
@@ -153,7 +153,7 @@ The following arguments are supported:
 * `hostname` - (Optional) The hostname of the instance. Windows instance: The name should be a combination of 2 to 15 characters comprised of letters (case insensitive), numbers, and hyphens (-). Period (.) is not supported, and the name cannot be a string of pure numbers. Other types (such as Linux) of instances: The name should be a combination of 2 to 60 characters, supporting multiple periods (.). The piece between two periods is composed of letters (case insensitive), numbers, and hyphens (-). Modifying will cause the instance reset.
 * `instance_charge_type_prepaid_period` - (Optional) The tenancy (time unit is month) of the prepaid instance, NOTE: it only works when instance_charge_type is set to `PREPAID`. Valid values are `1`, `2`, `3`, `4`, `5`, `6`, `7`, `8`, `9`, `10`, `11`, `12`, `24`, `36`.
 * `instance_charge_type_prepaid_renew_flag` - (Optional) Auto renewal flag. Valid values: `NOTIFY_AND_AUTO_RENEW`: notify upon expiration and renew automatically, `NOTIFY_AND_MANUAL_RENEW`: notify upon expiration but do not renew automatically, `DISABLE_NOTIFY_AND_MANUAL_RENEW`: neither notify upon expiration nor renew automatically. Default value: `NOTIFY_AND_MANUAL_RENEW`. If this parameter is specified as `NOTIFY_AND_AUTO_RENEW`, the instance will be automatically renewed on a monthly basis if the account balance is sufficient. NOTE: it only works when instance_charge_type is set to `PREPAID`.
-* `instance_charge_type` - (Optional, ForceNew) The charge type of instance. Valid values are `PREPAID`, `POSTPAID_BY_HOUR`, `SPOTPAID` and `CDHPAID`. The default is `POSTPAID_BY_HOUR`. Note: TencentCloud International only supports `POSTPAID_BY_HOUR` and `CDHPAID`. `PREPAID` instance may not allow to delete before expired. `SPOTPAID` instance must set `spot_instance_type` and `spot_max_price` at the same time. `CDHPAID` instance must set `cdh_instance_type` and `cdh_host_id`.
+* `instance_charge_type` - (Optional) The charge type of instance. Valid values are `PREPAID`, `POSTPAID_BY_HOUR`, `SPOTPAID` and `CDHPAID`. The default is `POSTPAID_BY_HOUR`. Note: TencentCloud International only supports `POSTPAID_BY_HOUR` and `CDHPAID`. `PREPAID` instance may not allow to delete before expired. `SPOTPAID` instance must set `spot_instance_type` and `spot_max_price` at the same time. `CDHPAID` instance must set `cdh_instance_type` and `cdh_host_id`.
 * `instance_count` - (Optional, **Deprecated**) It has been deprecated from version 1.59.18. Use built-in `count` instead. The number of instances to be purchased. Value range:[1,100]; default value: 1.
 * `instance_name` - (Optional) The name of the instance. The max length of instance_name is 60, and default value is `Terraform-CVM-Instance`.
 * `instance_type` - (Optional) The type of the instance.