Competence - based teaching has been a concern of many educators in the current period. Preparing the lesson plans before classes greatly determines the success of the lessons. Applying scientific research methods such as theoretical research, investigation-observation, expert method, the article presents the structure and process of designing lesson plans for Mathematics, analyzes and clarifies the steps in the design process, thereby applying the design of specific lesson plans to facilitate teachers in the teaching process. The results published in the paper are unanimously agreed by experts.