Based on air to ground bombing mode a controlled/autonomous attack system was designed for Unmanned Aerial Combat Vehicles (UCAV).The system has the advantages of autonomous decision-making capability adaptability to complex environment and high reliability which can reasonably eliminate the aiming deviation in attacking process.The control and guidance system was designed by using fuzzy control theory as a reference which combined the fire control system with the flight control system.Simulation results show that the UCAVs equipped with this system can achieve good performance in automatic ground target attacking.