In this paper , the design method and management of the object about the numerical manifold method are studied and the theoretical basis for the researching and expanding of numerical manifold method is also put forward. The characteristics of easy programming and simple preprocessing and postprocessing are clearly shown. The solution precison of multinode isoparameter element method can be acquired by simply using triangular manifold element and one\|order uniform polynomial approximation. The calculation results show that the numerical results are in good agreement with theoretical solutions.