Background : All managers want to improve their organization 's efficiency . The purpose of this paper In addition to the asses the efficiency of Hospital during the time, is trying to answer to this question that, is the recruitment of new personnel able to increase hospital efficiency?

  Materials & Methods : In this sectional study, the relative efficiency of Imam Khomeini Hospital in Arak during the thirty-one months Since April 2011 to November 2013 (16 months before and 15 months after the recruitment) by input-oriented DEA method with five inputs and five outputs and with considering each month as a decision making unit, was calculated by DEAP 2.1 software. Then, the efficiency scores during the two stages, once for sixteen months, and once for a total of thirty one month separately by Mann - Kendall test via Minitab 16 software was analyzed and the most important event in the hospital during the study period, was asked from hospital authorities.

  Results: Most inputs and outputs of hospital have increased. The efficiency of the last eight months was equal to one . In addition, the efficiency of eleventh month was lower. The value of z_s for first sixteen months and for a total of thirty-one months -0.55769 and 2.05318, respectively calculated .