Investigating the Effect of Leadership Style on Employees' Performance(case study: Deputy of Human resources of NAJA)

Certainly, human existence as a non-removable part of management, can be considered as the main challenge of managers,therefore, according to scientists and experts, although managers and commanders are responsible for a variety of tasks, leadership is the most important and, at the same time, the most difficult task for them to handle.  This study is a descriptive-tracingkind of study.  The statistical society is all the staff and directors of the deputy of Human Resources of NAJA (480 people) and its sample size is (215 people) based on the Cochran formula.   Considering the following: adopting different leadership styles and positive or negative feedback, and taking advantage of the findings of this research and in order to increase productivity and positive performance in NAJA’s human resources deputy, consultative and participatory leadership styles should be consideredand magisterialand supportiveleadership styles should not or less be considered.Conclusion is only applicable to the NAJA Human Resources Deputy Commandership and the use of this leadership styles are not recommended for other operational and executive categories.   regarding the aboveitems, there is a positive and direct relationship between selecting a suitable leadership style andconsidering the research findings. Which means the leadership style affects employee’s performance, and, this effect is positivesince β = 0.203.