For multi-spacecraft systems which carry co-operation or confrontation task in orbit, it is demanded to perform action deduction before task strategy can be uploaded. Also, evaluation of the system’s performance is needed, to guide future action deductions. However, real spacecrafts for the purpose of in-orbit operation are usually rare and insufficient to support large-scale task deduction or development of evaluation schemes. A potential solution is to establish a combined system with several physical system as reference, build a virtual system based on the physical world, run a simulation and deduction on the combined system with the virtual part as the main part, followed by an evaluation scheme elucidated from the deducted data. This paper provides an architecture for a virtual-reality combined system, together with technical exploration for the critical segment, resulting in a group of schemes for a virtual-reality combined system applied in the deduction and evaluation of multi-spaceraft systems.