In the process of automobile spraying, paint defects can be mainly divided into two categories:environmental factors and process factors. While process paint defects are affected by spraying equipment,construction process, coating characteristics and other factors, resulting in a more complex process of problem investigation and verification. Through the sorting out of the previous paint spot problem investiga tion and countermeasure verification process, this paper summarizes a set of systematic solutions, aiming to improve the efficiency of problem solving and provide reference for the peer.