Abstract: Architectures of existing parallel graphics rendering systems based on PC-cluster only allow single level parallel pipeline.In this paper we present a hybrid sort-first and sort-last architecture based on structure of dynamic rendering team,with two levels of parallel pipelines.The first level parallel pipeline is laid among dynamic rendering teams corresponding to separate screens,and the second level parallel pipeline,optimal consecutive-frame pipeline,is with in dynamic rendering team itself to improve the rendering,composing and display process,to form so-called nested parallel pipeline.Experiments show that,with nested parallel pipeline,parallel graphics rendering system based on pc-cluster can promote performance prominently in comparison with single level parallel pipeline systems.