The purpose of this study, to determine the effect of salesperson behavior on salesperson performance; the influence of the role of supervision on the performance of the salesperson and the influence of the performance of the salesperson on the marketing performance. A sample of all apparel SME salespeople in the city of Semarang, Indonesia. The sampling technique is purposive sampling with criteria for salespeople who have at least one year of experience. The data of this study are primary data generated through a questionnaire. The answers given by respondents using SEM analysis techniques, which are run through the AMOS 4.01 program. The results of the analysis provide empirical evidence that the behavior of salespeople and the role of supervisors can improve salesperson performance and have an impact on improving marketing performance.