Abstract: Neutral beam injection (NBI) is an important method of plasma heating and plasma current driving for magnetic confinement fusion device. A distributed control system is designed in this paper according to experimental operation characteristics of NBI on Experimental Advanced Superconducting Tokamak (EAST). The NBI control system based on network technology, classified according to control level, consists of remote monitoring layer, server control layer and field control layer. The three-layer control systematic architecture is easy for extending system functions and upgrading devices. Both ion sources of one NBI beam line are designed to operate independently, which lays a foundation for developing control system of the second beam line on EAST. Experimental results demonstrate that the visualization and automation of NBI experimental operations are successfully implemented by remote monitoring, interlock protection, and data processing.