Human resource management plays an essential role on the success of any business units such as utility firms. In this paper, we present a study to investigate the effects of different human resource management on employee performance. The proposed study is applied on one of gas distribution units in province of Charmahal-Bakhtiari, which is located west part of Iran. There were 161 people working for this firm where 75 employees were working in center of province and 86 employees were working in other sides of province. Cronbach alpha is calculated as 0.83, which is well above the minimum desirable limit. The study uses Pearson correlation test to investigate the effects of Hiring system, Training system, Job design, Organizational relationship and Share ownership programs on employee performance. The results of our survey indicate that job design is the most important technique for employee management followed by training system, organizational relationship and share ownership programs.