The laser direction finding technology uses the photoelectric detector to receive the laser signal, and calculates the angular deviation according to the deviation from the detector photosensitive surface to the spot center of the target, and then obtains the azimuth information of the target. Laser direction finding technology is widely used because of its large range of direction finding, flexible design of circuit and high precision of direction finding. The photoelectric detection device is the core device of laser direction finding technology, three main detection devices are introduced, the working principle and characteristics are discussed. The quadrant detector (QD) has more advantages through comparison, which is an ideal precision direction finding device, and is more suitable for tracking and measuring of high precision dynamic targets.