In order to solve the problem of low degree of digital design of C4ISR system, a model-based system design and simulation method is proposed to change the existing system design mode based on document. The design elements of C4ISR system are divided into basic resource class, common service class and application system class in this paper, in which, the classification system of the system design elements is established and the design elements are mainly characterized by basic resources and common services; besides, the application system is extracted. The parameterization model of the system design elements is established from the
perspective of structure, function and behavior. The parameterization model of system design elements is formally described by using block definition diagram, activity diagram and timing diagram of SysML. The parametric model of the system design elements can be directly mapped to the system simulation model, and the digital prototyping of C4 ISR system is built by the
model conversion technology so as to support the demand of the whole life cycle, the overall design, the function of sub-system design validation, iterative adjustment and optimization.