The contradiction between large Field of View (FOV)and high frame frequency of detector and the input coupling problems between coarse tracking and fine tracking sub-unit were analyzed in compound-axis servo system using a CCD detector. Smart controller was developed to change the parameters of CCD detector online and the status of CCD detector were changed between large FOV during coarse tracking phase and high frame frequency during fine tracking phase. The output information of PZT driver and miss distance given by CCD detector and image processing unit were synthesized as the control input of the coarse axis sub-unit. What’s more， the control method was simulated，at the same time，a method was presented to estimate the system whether decoupled or not according to the tracking accuracy. The experiment data show that the control methods adopted eliminate the coupling problems of the system and get a good result.