In order to realize on any direction of laser detection in a big field of view,and guarantee the stable structure,sensitive response,the low cost and so on,two-dimensional overlapping mask encoding method is proposed. The laser direction detection system uses six flat-window detectors,and it is constituted with two-dimensional separated mask in the horizontal plane. Using the mask and the detection angle,the field of view of the two-dimensional overlapping encoding can be calculated,and thus to realize the laser direction. According to the experiment,the laser direction can be calculated by the coding method with six detectors,and the accuracy of angle can reach 30°. The experiment of laser with incline incidence to the detectors shows that,under the most tilted angle of laser the response voltage of the detector is more than 40 mV,which is greater than the voltage arising from noise. Therefore,the field of view of the system is in the rotating area from 18° to 162°.