1. First, open WeChat and click the "Search" sign in the upper right corner of the "Address Book" interface. Click "WeChat Official Account" in the WeChat pop-up window.

2. Secondly, enter "Hainan Government Affairs Big Data" in the search bar, and then click on the official account of WeChat, and click on Hainan Government Affairs Big Data below. After entering the official account interface of Hainan government big data WeChat, click "Follow the official account of WeChat".

3. Then enter the official WeChat account interface, click "Health Code" in the lower right corner, enter the main interface of the health code system, and click "Login" to register.

4. Finally, click "Register Account" at the bottom of the newly opened window, fill in personal information, and then click "Get Verification Code". If you fill in the correct mobile phone number, you will receive a verification code message, fill in the verification code and click "Submit". According to your actual situation, fill in the information correctly and click "Submit".