According to the engineering support task, a mixed Agent architecture PCGFA was presented. Frame architecture of engineering support element agent was built and the work process of engineering support element was expounded. Adaptive neural fuzzy inference system (ANFIS) was applied to reasoning, learning and analyzing the work of building field shelter. A reasonable operating way of engineering support element was got. The inference system in this article was verified through the task records of the fortification element. The results show that the system had fast convergence rate and good precision and provided a method and thought for researching on mission planning for engineering support element.