A new method,named 'two point IRFPA nonuniformity correction method based on integration adjustment and noise equilibrium',to correct IRFPA nonuniformity in dim target detection system was presented.This method fully takes advantages of both demarcate-based and scene-based IRFPA nonuniformity correction methods.By considering dark current va-(riance) and noise characteristics of every detector cell into consideration,this method gives optimal S/N performance.Experiment results show that its performance is more perfect than that of two-point correction algorithm.