An object-oriented distributed programming language NC++ which is based on NOW (network of workstations) environment is introduced in this paper. It is an extension of DC++. NC++ gives a rather complete programming environment, including NC++ pre-compiler, visual-programming interface, multicast communicating facility and a test system. It improves the process group management and inter-process communication facilities, and puts forth a DSM (distributed shared memory) subsystem based on belief network, which is used to manipulate C++ global variables. In practice, NC++ offers simplicity for distributed program design without sacrificing the performance.