Main landing gear control method and device

The application discloses a main landing gear control method and device; a folding/unfolding subsystem and a brake subsystem of the main landing gear adopt a newly-added electric pump source assembly for supplying the pressure, so that after a control command sent by an outside world control system is received, if the control command is determined to be a landing gear folding/unfolding command, whether the electric pump source assembly is controlled to work or not is determined through the current position state of the main landing gear and the current pressure of the folding/unfolding subsystem; if the control command is determined to be a brake command, whether the control electric pump source assembly is controlled to work or not is determined through determining the current input pressure and the preset value of the brake subsystem. Therefore, the method and system can achieve the fact that the folding/unfolding subsystem is controlled to work by controlling the working state of the electric pump source assembly only after aircraft taking-off and before aircraft landing and the brake subsystem is controlled to work through controlling the working state of the electric pump source assembly only when an aircraft skates on the ground.