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With the application and development of new technology and new system, as well as the new demand for equipment system efficiency optimization, the traditional reverse construction demonstration of equipment is no longer applicable because it leads to the problems of unreasonable redundancy design and incomplete performance of the space launch site equipment system. It is necessary to adopt forward construction demonstration based on demand traction and technology promotion. This scientific approach meets the overall requirements and takes into consideration the long term. Taking the construction demonstration of the new optical equipment of the space launch site as an example, a complete set of specific process and methods analysis for the forward system design of the mainframe core capability of the optical equipment is carried out, which is to establish the forward system design model. Through the calculation and analysis of the actual scenario application of the designed equipment, it shows that compared with the traditional reverse demonstration of the equipment, the optical equipment based on the joint work of multiple equipment systems, the system functions are positioned to maximize the effectiveness, which shows that the rationality and effectiveness of the forward system design model are verified. The system design model can provide an effective reference for the forward system design of space TT&C equipment.