Due to the large quantity and flow of students in the open laboratory, the problem of apparatus power management occurred. To solve the problem, the article designed a power control system with PC, MCU, power line carrier models and relays etc based on power line carrier, which include the upper PC, the central station and the slave stations. A friendly interactive interface is designed by VC in upper PC, through which the teacher can control the slave station to open or close the power. The central station which based on STC12C5A08S2 is used for the information retransmission between the upper PC and the slave station. The slave stations which based on AT89S52 control the power through the relays. The central station and the slave station constitute the distributed communication system based power line carrier through power line carrier models. After working and testing, the system have the characteristics of stable working and convenient operation, which can meet the needs of the real application.