Through the analysis of the problems affecting the qualified rate of flame gold spraying,the lacquer floating was identified as the main defect.Through the system diagram analysis from the 5M1E,combined with the C&E matrix scoring identification,four key influencing factors were determined.In combination with the actual production site,orthogonal test analysis was carried out to finally confirm the optimal level.Through construction adjustment,the qualified rate of flame retardant gold spraying was greatly improved.