With the development of computer simulation technology and the requirement of enhancing the fidelity of combating training on the sea, it is inevitable to integrate computer computer generated forces(CGFs) into military simulation system. And the CGFs must act as an actual enemy commander in the virtual sea battle space. For the purpose of reuse and expandability of a synthetical combating simulation components which had been worked out in the past, it is developed to be HLA-compliment In this paper, special emphasis had been put on the building an extensible and flexible architecture of the CGFs which could be integrated into such an synthetical combating simulation system. The precess of decision-making is found on the analysis of behaviors that an entity commander would act in real sea war.