In order to better support the construction and application of ballistic missile early-warning operation simulation system (BMEWOSS), some key issues of military general design were studied. Through the analysis of operation environment, operation mission and operation entity, confirms military requirement of BMEWOSS, designs military frame of BMEWOSS, including development purpose, application range, use flow, function system and logic structure, puts forward the conceptual model system of BMEWOSS. Practice shows that the method of system military general design provides correlative operation simulation system with reference in theory.