Abstract: The research of virtual machine in substation plays an important role in many fields. In view of the

low maintenance efficiency of virtual machine substation，a virtual machine substation maintenance system based on virtual reality（VR）technology was designed. Using VR technology，the three-dimensional operation scene of virtual machine substation was established，and the scene was mapped and processed，and the substation operation system was represented in digital mode. Aiming at the problems that are easy to occur in the virtual machine substation operation system such as power failure and signal processing，the functional modules of the virtual machine substation maintenance system were designed. The network structure of the virtual machine substation was changed and calculated by using the simulated operation of trainees，and the calculation results were sent to the protection device of the virtual machine，so that the design of the virtual machine substation maintenance system was realized.The experimental results show that the virtual machine substation maintenance system based on VR technology has high efficiency and high maintenance efficiency.

      Key words: virtual reality（VR）technology；virtual machine substation；maintenance system；functional module