Abstract: The inverse analysis in geotechnical engineering is a typical complicated nonlinear function optimization problem. The global optimization algorithm is a very good method to solve this problem. Based on ABAQUS, the inversion model combining the genetic algorithm and finite element method is proposed, in which ABAQUS is embedded as a module in the genetic algorithm. The error function is established between the actually measured and corresponding calculated results. Through a tunnel model as an example, the proposed inverse program is verified; the results show that this method is a very good inverse analysis method and its efficiency is quite good.