The general design of HLA based communication command equipment operation simulation system is given to solve the difficulty of large equipment operation training. Firstly, the simulation system and its constitution are introduced. Secondly, two different federation runtime structures including single federation basic structure and multiple federations structure are designed according to system architecture. Thirdly, information interaction mode of training and FOM are concluded. Finally, two kinds of system application modes consisting of communication skill training and communication command training are presented.