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Abstract The object-oriented programming method is introduced. By this method，the classes of finite element models are designed and their C++ description and the implementation are given. A geotechnical engineering FEM software based on Window95/98/NT is designed and developed. The common FEM classes are：the class of matrix，element class，node class，Gauss class，shape function class，stress class，load class，distributed force class，the drawing class，mesh class，region class，boundary class，word class，etc. The basic program frame and the codes are given.
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Received: 29 February 2000
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