This thesis is to study the electronic load control system, using lower-cost chips and fewer parts to achieve with CC and CV mode of electronic load. And the use of low-cost MCU, via a program written to adjust program parameters, to avoid load machine of aging caused by the load , because this is the use of low-cost MCU, so in order to reduce the MCU burden, dual MCU system architecture. In the thesis, the use of Microchip's chip is with the MOSFET constant current and constant voltage circuit, and it designs a maximum voltage of 30V and maximum current of 4A electronic load mainframe.