The invention relates to a limit load regulating method of a static pressure driving bulldozer using an electronic control motor, comprising the following steps of: storing the external characteristic curve data of the electronic control motor in a driving controller; receiving an accelerator position signal, a rotating speed signal and a torque signal of the electronic control motor from a motorcontroller through a bus; perceiving the working state of a current motor in real time; comparing with the external characteristic curve data of the electronic control motor, which is stored in the driving controller, to obtain the torque difference value of an ideal working point of a current accelerator position; then computing target discharge amount signals of a variable pump and a variable motor which need to be regulated according to a driving oil-pressure signal input in real time and a corresponding algorithm, and then outputting a signal to regulate the discharge amount of the variable pump and the variable motor so that the working point of the electronic control motor is kept within an appropriate range, wherein the driving controller internally sets an efficient working mode and an economic working mode. The invention can accurately control working regions of the motor, prevent the overload and the flameout of the motor, also meet the requirements of different working modes on the working regions of the motor and realize the idealization of the working state of the bulldozer.