In order to evaluate the comprehensive efficiency of equipment technology support unit, the efficiency evaluation method based on data envelopment analysis method is put forward. By taking the technical support unit as a multi input and multi output decision-making unit, according to the characteristics of technical support units, the system of in-out index is founded, a computer aided decision making method based on data envelopment analysis is established and carried on the example to verify. The results show that the data envelopment analysis method is reasonable and effective in evaluating the efficiency of the equipment support unit. This shows that the equipment technical support unit is suitable to use the data envelopment analysis method to evaluate the efficiency.