Geometric components analysis of plane system is one of the most important and difficult parts in the course of structural mechanics, and it is the basis and prerequisite for the study of the following content of structural mechanics. In view of the practical problems encountered by students in geometric components analysis, "2+2+3+4" model for geometric components analysis was put forward through analysis, induction and summary of a large number of problem sets. The model makes the process of geometric components analysis of plane system be carried out in accordance with certain model and steps, and makes the seemingly impossible analysis become rule-based. According to the three different methods for geometric components analysis, examples were respectively supplemented in detail with analysis steps. It provides new model and reference for geometric components analysis of plane system in structural mechanics.