Abstract: CGF（computer generated forces） is one of the seven kinds of simulation entities in DVENET. The behavior of CGF entities is controlled by computer program （arithmetic）. The goal of developing a CGF system lies in increasing the quantities of entitities and improving the complexity and facticity in a virtual battlefield environment. Here introduced is the realization of a part of CGF fighters and CGF tanks low level intelligent behavior in the current version DVENET. The imagination on a more perfect CGF system in a future project is also discussed.