Who should I ask to solve the problem of water leakage in the upstairs house?

Legal analysis: Find out the reason of water leakage in the upstairs house, find upstairs neighbors, find developers and find property management companies. First, let's see what caused this situation in the house. If it is the reason of the neighbors upstairs, you can naturally ask the neighbors to handle it at this time. But if the developer or property company causes the water leakage, it has nothing to do with the neighbors. At this time, developers or property companies can be required to carry out corresponding maintenance.

Legal basis: Article 285 of the Civil Law of People's Republic of China (PRC), a realty service enterprise or other manager shall, on the entrustment of the owner and in accordance with the provisions of the third part of this Law on realty service contracts, manage the buildings and their ancillary facilities within the building division, accept the supervision of the owner, and promptly answer the owner's inquiries about realty service. Property service enterprises or other managers shall implement emergency measures and other management measures implemented by the government according to law, and actively cooperate with relevant work.