The theory model of current RC section non-linear analysis is studied to clarify the data demand, algorithm characteristics and data processing pattern. Parametric object-oriented modeling method is adopted to express the data demand of RC section non-linear analysis and the corresponding building information model (BIM) is developed. The BIM is used to fit the constitutive relationship of concrete according to environmental condition, loads and internal factors. Furthermore, Non-Linear Analysis System is developed based on the BIM to automate the analyzing process of deterioration laws of RC section under conditions of environment, loads and internal acts. A case study is elaborated to demonstrate how the system is capable of conducting the RC section non-linear analysis and the results fit well with the data from detection on spot.