Recently we hold a serious problem for the transfer of the technical skill in the manufacturing industry of our country. We develop the training method that combines virtual training used virtual reality and kinesthetic device for and a conventional training by on-the-job training. When we aim at a more effective skill transfer, we need to pay more attention to a skill level and the work characteristic of the worker. We take up mold assembly under the virtual reality environment, and discuss about mastery process of the skill and the work characteristic when plural subjects repeat training.