Objective:This study explored the cognitive regulatory mechanism of error monitoring behavior and brain activity during the anticipatory processing of athletes from the perspective of error monitoring.Method:40 expert group(elite basketball players)and novice group(college students majoring in sports but not basketball)athletes to watch different judgment time(shooting stage,rising stage,high point stage and falling stage)and shooting results(in,out)shooting video,predict the fate of the ball and report error consciousness level.Latency and peak amplitude of subject accuracy,certainty,P3,N400,ERN and Pe were recorded and analyzed.Results:In the early stage of the shooting action,expert group had the higher accuracy for the in shots,but lower accuracy for the out shots,where the degree of certainty is positively correlated with the accuracy rate;the peak amplitude of ERN and P3 was greater than that of the novice group.In addition,the excellent group found the larger N400 peak amplitude in the out condition,the smaller Pe peak amplitude in the in condition.Conclusions:1)sport expertise can promote the athletes'ability of error monitoring,and the time course of error monitoring in the expected movements of excellent athletes is manifested in the early stage of action execution.2)The error monitoring of expert athletes shows advantages in both behavioral characteristics and cognitive neural changes,and the quality of the error monitoring of athletes affects the performance of action prediction.3)The level of error monitoring of elite athletes can regulate the influence of sport expertise on prediction performance.