Angular drift is one of the most important parameters of the optimization of microchip lasers′ design and application, but such drift data haven′t been reported. A measurement system of angular drift based on the four-quadrant photodetector and the LabVIEW software platform is developed to realize the real-time operation to angular drift signal, including display, reading and recoding. This system realized the measurement of angular drift′s order of magnitude and the variation regularity with pump power, provided the basic data for the optimization of microchip lasers′ design and application.