Using a 4×4multi-pixel photon counter (MPPC) array as a echo detector,an upgr aded satellite laser ranging system with a 1.2m aperture telescope is desig ned,and the experiments for diffuse reflection target and AJISAI satellite are carried out at Yunnan Obs ervatories.Aluminum foil at an approximate distance of 45m with an area of 60cm×40cm acts as a d iffuse reflection target.Both single-channel output signal and combined 16-channel output signa l are captured by an oscilloscope,which show that the combined output signal has a much higher ampli tude than that of single-channel output signal,indicating that more than one channel of the arra y can respond for photons. Event timer records both the starting timestamp and echo timestamp,from which t he distance can be obtained.Ranging results for diffuse reflection target shows that the root me an square (RMS) is about 21.7cm, which matches the laser pulse width and the range error caused by reflection tar get′s form effect.Experimental performance shows that the array-type MPPC detector has certain advantages over a single-u nit detector.The MPPC array detector used in experiments needs further improveme nt for better performance in future SLR.