In order to detect the phase current in real time, the traditional power inverter circuit for brushless DC motor (BLDCM) controller of electric vehicle sampled the phase current through the resistor and fed it back to the microcontroller unit (MCU) for current loop closedloop control. However, when the controller was used in high power levels, the heavy current would cause some power loss. In order to solve the problem, a set of electric vehicle controller circuits with STM32 series microchip as the core was designed. The hardware controller of BLDCM was described in detail. To improve the shortcircuit protection circuit of power supply, a new method for sampling internal resistance of MOS tube was especially proposed, and a PCB based on aluminum substrate was made. The test results showed that the designed circuits performed reliably and could be applied to industrial production.