Hefei Grand Sky Phase III property is terrible, how can I defend my rights!

This is not the responsibility of the property! You don't even know who is responsible. If the house is still under warranty, it is the responsibility of the developer, who is obliged to repair it for you. If it is outside the warranty period, it is the owner's own responsibility. Property management companies only manage venues, facilities and equipment in public areas. If the cause of water leakage is a pipeline problem, the beneficiary of the pipeline should be found to bear the cost.