In view of the two disadvantages of current short-range missile warning equipment—one is that the scanning system can't get high quality image and the other is that the cost of staring system is too much,a scanning method about a kind of staring IRCCD detector was studied.The non-constant step-stare control method was applied to a small compound missile warning system.We compared conventional control means and step-stare control means,and focused on solving the application problem of the control technology in the IR scanning system.This project was used for a waning system.The distinguishing rate is 0.01° when the azimuth error is limited at 0.4mrad.The control method can be also applied to other warning detection equipments.