There is no additional charge for using Amazon Virtual Private Cloud, aside from the normal Amazon EC2 usage charges.

NAT Gateway Pricing

China (Ningxia) Region

If you choose to create a NAT gateway in your VPC, you are charged for each “NAT Gateway-hour" that your NAT gateway is provisioned and available. Data processing charges apply for each Gigabyte processed through the NAT gateway regardless of the traffic’s source or destination. Each partial NAT Gateway-hour consumed is billed as a full hour. You also incur standard AWS data transfer charges for all data transferred via the NAT gateway. If you no longer wish to be charged for a NAT gateway, simply delete your NAT gateway using the AWS Management Console, commandline interface, or API. 

Price per NAT gateway (¥/hour) ¥ 0.37
Price per GB data processed (¥) ¥ 0.37

China (Beijing) Region

If you choose to create a NAT gateway in your VPC, you are charged for each “NAT Gateway-hour" that your NAT gateway is provisioned and available. Data processing charges apply for each Gigabyte processed through the NAT gateway regardless of the traffic’s source or destination. Each partial NAT Gateway-hour consumed is billed as a full hour. You also incur standard AWS data transfer charges for all data transferred via the NAT gateway. If you no longer wish to be charged for a NAT gateway, simply delete your NAT gateway using the AWS Management Console, commandline interface, or API.

Price per NAT gateway (¥/hour) ¥ 0.427
Price per GB data processed (¥) ¥ 0.427