A virtual roaming system of Pingdingshan museum by Virtual Reality Modeling Language(VRML) is designed in order to promote the development of virtual reality and digital museum, and enable visitors to visit the museum in an immersive way through the network. Geometric modeling, user interaction behavior, navigation and other key technologies in the development process are studied. An optimization program of virtual museum based on VRML is presented. The program ensures that customers view roaming system smoothly, and solves the display problems of the details of the museum exhibits. Finally, a virtual roaming system of Pingdingshan museum with relatively perfect functions is realized. The system is combined with multimedia, navigation, roaming, interaction and play control．