How to self-query patent documents? Does that mean you applied for a patent right?

Enter the China National Intellectual Property Administration page, click on the patent search, and enter the patent number or name. If it can be found, the utility model is authorized and the invention patent has been made public. If the technology is basically the same, you can't apply for a patent again, and you won't be authorized to get a patent certificate if you report again. Or directly in Baidu search patent search, you will enter the search page.