In order to filter the noise of the photoelectric position sensor(PSD) using for the target tracking system and improve the precision and stability,a morphology filtering method based on the combination of open-closing and close-opening operator was proposed.By selecting a proper structure element,the noises of one dimension or two-dimension position signal in PSD were analyzed and lowered,and stable location information can be obtained.Then,the location data can be used in the tracking system.The experimental data show that the morphology filter can effectively filter out the random noise,pulse noise or mixture noise.Because this algorithm is simple and easily realized,it can be used in the real-time testing field or other signal processing.