This research was administered with the aim of investigating the role of job characteristics, transformational leadership and goal difficulty on employees, performance… Research statistical population were the personnel of minerals and industries Holding of Ehya Folad Sepahan company in autumn 1388 (2500 persons), which from them, 329 persons was selected using two stage sampling. Research instruments including; transformational leadership with 22 items (with four subscales, namely group goals, personal support, intellectual role model and high performance expectancies), goal difficulty with 5 items, job characteristics with 23 items (with 5 subscales, skill variety, task identity, task significance, autonomy and feedback) and job performance with 6 items (with three subscales, general performance, technical performance, and interpersonal performance). Data were analyzed with the use of Pearson's correlation coefficient and stepwise regression analysis. The results of stepwise regression analysis showed that for prediction of general job performance, goal difficulty, skill variety and high performance expectancies, for prediction of technical job performance, group goals, goal difficulty and high performance expectancies, for prediction of interpersonal job performance, goal difficulty, skill variety and intellectual role model and for prediction of total performance, skill variety, goal difficulty and high performance expectancies have highest predictive power for prediction respectively (P<0/01).