Abstract: In order to facilitate the application and verification of numerical calculation in practical engineering design, a simplified generalized potential theory elastic-plastic model is integrated into the large-scale numerical analysis software, and the calculation analysis and triaxial test verification are carried out in a six-dimensional stress-strain space. Firstly, based on the \sigma _1\text-\sigma _3 potential surface model and p-q potential surface model of the generalized potential theory, the corresponding dynamic link library (DLL) model library files are constructed by means of VC software programming. A practical engineering analysis object is established by FLAC^3D, and the six-dimensional stress and strain calculation and analysis are carried out by calling the developed model library file. Finally, the accuracy of the developed model is verified by the triaxial test results, which provides a basic support for the application of the simplified elastic-plastic model of the generalized potential theory.