In order to solve the visual problems of large-scale scientific computing, the project imports the middle ware for communication, and extends the classic client-server structure into client-commware-server structure. The paper proposes a visual system model for large-scale scientific computing based on client-commware- server structure, PC-cluster and largescale display technology. The visual system model has the virtues of generality and excellently interactive capacity, and has successfully been applied to PRIS (Parallel Reservoir Integrated Simulator), a visual system of large-scale oil simulation. Applied results prove that it has a widely applicable prospective.