Abstract: The infinite boundaries are existed in foundation engineering as well as underground engineering. The conventional finite element method is used in solving these problems, a large limited area is considered and certain boundary condition is imposed to simulate the infinite boundaries. The dilemma between the computational time and the accuracy achieved is usually induced from this approach. The combination of infinite element and the finite element theories throughout a C++ programming method so that the finite element meshes can have infinite elements. As a result, the computation time can be limited without the computation accuracy.

Key words: infinite elements, finite element method, infinite space, spatial problems