This invention relates to a DC brushless motor system composed of a DC brushless motor unit and a controller unit, in which, A, the motor unit includes a stator component, a magnet rotor component coupled with the stator component, a shell bearing installing the stator component and the magnet rotor component and an end cover installed at the end of the shell and an end cover covering the shaft of the magnet rotor component at the top, B, the controller unit includes an integrated power module, a microprocessor unit, a rotor position sensing circuit, a supply process circuit, an I/O interfacecircuit, a current sensing circuit and a controller box, C, the controller unit is set at the bottom of the motor unit and electrically connected with the motor unit, and multiple control units working on multiple control modes and controlling the work performance of the motor are stored in the microprocessor.