How to inquire about the online filing of Huainan houses?

I helped you look at that website. You can click "More" in the "Latest Pre-sale Information" on the homepage, and then enter your residential area in the "Pre-sale License Number" dialog box on the newly appeared webpage to find your real estate. Click "Expand" next to "Building Information" and select "Property List" to see the building unit number in table form, and each different color represents different things. You don't need to enter a user name and password. Developers use it to sign contracts. You don't need to go in there.