Abstract: The well known methods for a very large scaled structure problem, including domain decomposition method (DDM), DDM with Neumann preprocessing, BDD method and projected CG method, may involve problems that the divergence prevents from solving, and that the computation takes long time. The present invention provides a system of high potential computing performance for solving a very large scaled structure problem without divergence, with shorter computing time for a very large scaled structure problem of the degree of freedom of a million or more.