The SCM control system is composed of DCU(urea injection control unit), LCD touch screen, relay unit and function key (indicator light).Control system is the core component of SCR system, responsible for sensor signal acquisition, ECU communication, actuator work, etc.The touch screen can realize the visualization of key parameters of the system, and it has functions of alarm, emergency brake stop, manual control and so on.The control system is a collection, control, display, alarm in an integrated module, easy to install and maintain;And the structure design is reasonable, compact and beautiful.