It will be helpful for analyzing , understanding and graspmg the soft structure and its course of Fìre control computer by tracmg the execute address of the computer software , thus meanìngful to patchmg up the orìginal software. The execute address tracmg system usmg ISP and DMA can trace and record the extcute address of the Fìre control computer at dìfferent status. Forthermore , the tracmg system can take the dìfferent length address tracmg recording according to the specific requlrement.