In this paper, we describe feasibility analysis of zigbee protocol in wireless body area network (WBAN). we use NS2 to simulate data from oscilloscope as model for physiological signal from sensor to WBAN's server. four sensors were mounted in patient body and send the data simultaneously to the server using zigbee protocol. simulation result shows that packet loss, throughput and delay of the data transmission using zigbee protocol is feasible to use in WBAN's data transmission.