This paper proposes the standardization in the field of education and training for maintenance personnel. This is particularly important because of the following reasons: firstly, most of sophisticated system or equipment are getting more and more important in terms of cost, quality, product liability, etc. and so the economic and social responsibilities of maintenance men play more important role in business activities. Secondly, maintenance works have been one of 3D jobs and so it is required for maintenance men to have motivation for higher performance. Even though maintenance works depend upon contingency factors, the development of standards of maintenance works and appropriate education and training, and implementation through the incorporation in national standards or possibly internationally are necessary. This paper identifies 5 kinds of skills and each skill includes 6 to 11 different kinds of sub skills and is classified as 3 levels, such as basic, technical and specialty.