Aiming at the problem of information hugeness, formal diversification and alternation feedback difficult, trainers’ virtual maintenance training process that the information in virtual prototype of equipment, tool and facility of maintenance, interaction between person, analyzes the constitutes and relationships of every maintenance operation, presents a training process model which can support learning, training and examining by a normative language named Grafcet. The model can regulate and control effectively operating flow and the behavior of interactive information in trainers’ virtual maintenance training, and it improve training affection.