What should I do if the supervision of illegal construction of residential property is not good?

You can report to the Property Department of the Housing Authority in your district. You should be able to find the phone number of the Housing Authority online, and then call the Property Department for the phone number. According to the regulations, the Housing Authority must arrange a special person to check and verify the report of illegal construction. However, property supervision is weak and it is difficult to define. After all, property is just an enterprise, not a government department. Just verbal warnings and rectification notices. Other things can't be done, and it is illegal to do it.