An electric control system of force actuators in large astronomical telescope is disclosed. The mirror is composed of several sub-mirrors. Behind each sub-mirror there are a force actuator and a force sensor connected to computer. The said control system is composed of active optical controller, several general-purpose digital interfaces, user interface controller; force actuator controllers and force actuators, all of which are sequentially connected. Its advantage is the synchronous operations of actuators under the control of computer.