May I ask the detailed address and mailing requirements for mailing individual patent applications to the State Patent Office?

It can be sent directly to China National Intellectual Property Administration Patent Office: Reception Office of China National Intellectual Property Administration Patent Office, No.6 West Tucheng Road, Jimenqiao, Haidian District, Beijing 100088. Registered mail must be used, and the certificate of registered mail must be kept to determine the application date (postmark date).