In order to solve the unstressed configuration of beams, the accurate computation element disintegration theory, named as geometric method and zero-loads method, was created based on the theory of nonlinear second order beam-column theory and CR-UL total deformation theory. The basic parameters of unstressed configuration of beam were firstly solved by using the geometric information and corresponding element resistance of the objective configuration. The full unstressed configuration of component element was also confirmed by using the geometric method as coordinate transformation. The zero-loads method as converse calculation based on these basic parameters was then proved to be effective. Moreover, a program was compiled to verify the above two methods. The results show that the geometric method for full unstressed configuration of beam elements in this paper could be executed efficiently without the finite element model of full structures, and the zero-loads method could be executed efficiently under the condition of impeccable geometric nonlinear program.