Abstract: Aiming at the photoelectronic tracking system marched weapon systems, we expounded the considerations for its demonstration and design, discussed the selection principle for the detector of the optoelectronic tracking system as well as the advantages/disadvantages of the T-model and U-model structures from the actual situations.Moreover we analyzed the main factors determining the critical indicators such as tracking distance,tracking precision,response speed and working scope. Corresponding to the critical indicators, we also determined the factors influencing the indicators of EO system inside. Furthermore we proposed some related techniques, including guiding interception function,relationship among optical axes,and so on.