The emerging technology of wireless networking provides many applications for regular routines, saves the time and cost. One such application is wireless body area network (WBAN) which reduces the overall burden of people through caring aged people, prolonged diseases and so on. It provides a better quality of life and continuous support at home itself. WBAN is formed with low energy, power, and data rate devices and results better performance. There are several factors limits the performance of this network for e.g. distance between nodes, power, interference etc. So this paper aims to present a suitable method for energy aware relay selection algorithm using fire fly algorithm. Through this method, ideal relay nodes are selected based on residual energy. © 2016, International Journal of Pharmacy and Technology. All rights reserved.