The most common used method in traditional laser ranging is photon detection by a unit APD working in linear mode.As the detection distance increases,the linear gain does not meet the needs,and the Geiger mode APD comes into being.Array detection Geiger mode APD is a new type of detection device with the ability to detect single photon energy level signals.With an internal gain of 1×106 to 1×107 ,it has a high response degree,but it is greatly affected by the background light,so the signal processing of this device is extremely difficult.In this paper,three methods of array signal processing based on the photon counting method are proposed,all of which can greatly improve the signal contrast.Among them,the multi channel accumulation algorithm is convenient and highly implementable；the spatial convolutional pooling algorithm has high signal dispersion sensitivity；and the array expansion algorithm has high signal recognition.