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This paper first analyzes the shortcomings of existing traditional laboratories, proposes the necessity and significance of establishing network virtual laboratory, then on the basis of a lot of foreign literatures about virtual experiments describes the development status of virtual experimental systems, including the basic features, classification, and development direction of virtual experimental systems, as well as the basic frame structure and the current related techniques, finally designs and implements an integrated virtual laboratory. The virtual laboratory mainly adopts VRML technique to accomplish the 3D modeling of network equipment, and adopts 3DSMAX software for the modeling of some more complex models, then transforms the modeled models into the VRML files utilizing its special output interface. This system realizes various possible interaction means used in the demonstration and observation of the experiment process, so provides VRML with powerful dynamic effects. Fo