Abstract: The topic discussed in this article is how to organize a microprocessor based system which is intended to implement the automatic computation of shooting track and then to control the fire system. The main part of this article introduces the model machine of microcomputer system for computing shooting track. The system is designed using a microcomputer Kit model Tp801 with some modification. The result of research has found the way to use the microcomputer technique in fire-control system within the fighting vechle.