The technology of a company is represented by its technology standards, and their exhaustiveness and consistency are important for the competitiveness of the company. We had developed a systematized business process model for plant maintenance as the IDEF0 (Integration Definition for Function) activity model, and the requirements of technology standards had been defined. In this study, the framework to generate engineering standards is proposed. The requirements for engineering standards are analyzed on the basis of the developed business process model for maintenance, and two types of standards are found to be necessary for each required engineering standard. From the property of these standards, the IDEF0 activity model to generate engineering standards is developed.