CARR power supply system mainly consists of such subsystems as medium voltage,low voltage,direct current,standby,and emergency power supply systems.The general feature,main function & design principle are described in brief and the constitution,performance,characteristic & function of subsystems are also expatiated in detail in this paper.The engineering design of CARR power supply system follows the associative requirement of nuclear safety code and industrial standard,and can provide the operation system function and security function of system.