Finite Element Method (FEM) is one of the techniques for deformation simulations of human tissue. The basic concept of FEM is the discretization of an object into FE-model that consists of simple geometry called elements. Although The most common type of elements are tetrahedral elements, Hexahedral elements have an advantage of analysis accuracy. However, automatic generation method of hexahedral elements for complex shape have not been established. This paper proposes a method that generate generate hexahedral finite element model for complex shape using Growing Self-Organizing Deformable Model (GSDM). By several simulations using our proposed model, we confirmed that deformation analysis is performed with higher accuracy and in a shorter time.