Based on the reinforced concrete nonlinear finite element structural analysis model and MFC(Microsoft Foundation Class Library), the classes in object oriented programming are developed for the reinforced concrete nonlinear finite element analysis. These classes include the concrete element class, bar element class, bind element class and nonlinear element class. The descriptions and implement approach for the classes are given. All proposed in this paper provide an approach to using the more reasonable object oriented programming for the reinforced concrete nonlinear finite element structural analysis.