In the previous reports, the multi-media contents which support understandings of the operation principle of internal combustion engine were developed, and these contents were practiced in the machine practical training subject, and the learning effect was examined by the short tests and questionnaire. In this paper, the learning effect of this animation contents for practical training was examined by a problem which ask the role of the part which constitute the diesel engine. The learning effect of this animation contents was confirmed as a result of examining the proportion of learner who got correct answer in the limited time.