A DC brushless motor pump comprises a stator unit consisting of a plurality of silicon steel laminations and a coil, a rotor, an excitation circuit connected to the stator unit, a signal controller supplying power to the excitation circuit, and a magnetic induction module connected to the signal controller to control the pump running. Further, in the pump, a cylinder is provided between the stator unit and the rotor. An orientation component that protrudes in a radial direction is provided on an outer circumferential wall of the cylinder so that the magnetic induction module may be mounted onto the orientation component. Thus, the orientation component is used to fix the magnetic induction module for increasing the accuracy of detection.