Abstract: A collaborative and parallel visualization model is presented.The system structure, which consists of five levels,is hardware independent and portable.A cache coherent Distributed Shared Volume Buffer （DSVB） manages distributed storage of large volume data,and provides an uniform access to it.With the Distributed Visualization Application Interface （DVAI）, the parallel visualization programming is transparent to high-level applications.The Human-Human User Interface is designed to support the cooperative work,and provides more natural way of Human-Human communication.