The Tracking system can measure the traveling distance with the laser working in infra-red wave band by measuring the phase difference with modulated light wave shuttling the measured distance. Since noise contained signal process of the hoist's distance measuring is realized by wavelet transform. Based on different properties of noise and the signal working in different scale, noise can be eliminated by consulting the threshold value, after that real signal will be reconfigured. This system can improve the precision of distance measure by showing the hoist's real location exactly. Date process of laser location-tracking signal can be realized by the simulating of MATLAB software. All in ail, this system can realize digital control of the riser's location and speed.