1. website revision: website revision or update will make it inaccessible. I suggest you try again later. 2. System crash: Because a large number of people use the website at the same time, the instability of the system server will cause the website to temporarily crash, and then try to log in to avoid the peak period. 3. Network and browser problems: ① Check whether there is a computer problem. You can try to install a third-party browser (such as Google browser and Firefox browser) first. If not, reinstall the operating system and try to reinstall the driver. (2) Check whether there are network problems, try to switch networks and open this website. If you can surf the Internet normally, check what network you are using. If you can't open it, it depends on what network you are using. If an operator's network can't be opened, please contact the operator's official customer service for a solution.