This work develops a set of all-electric control system for subsea X-tree, including master control station, uninterruptible power system, electrical power and communication unit, power regulation and communication module, and subsea control module. A double redundant structure design methodology is adopted to develop the hardware system in order to improve the reliability. A software system is then developed to monitor and control the working conditions of the production circuit, the annulus circuit, and the chemical injection circuit of the all-electric subsea X-tree. The developed system realizes the functions of oil production, monitoring control and fault alarm.