Line maintenance is an important link to ensure the operational safety of flights. Traditional maintenance training methods, including lectures, tests and on-job training, have limited effect on training of practical skills. Combining VR technology with model-based methods can better reproduce training scenarios on the one hand; and the evaluation of training effects can be achieved by combining the occurrence probability of actual events with training scenarios, content and processes on the other hand. In this paper, we selected the line maintenance walk around inspection that is frequently performed in the aircraft maintenance, explored the transfer of virtual reality technology and CAD modeling, and established authentic and flexible aircraft and component models. Combining the design of scenes, modes, interactions, and processes, an experimental prototype system for VR walk around inspection training was established. Formula based on historical data and human error factor for fault and defect presentation was developed, the training and exam function for line maintenance walk around were realized. According to analysis of the data collected from the trial process, the value of the VR system in the maintenance training was proved, which can provide reference for further in-depth research.