Abstract：The deep-searching strategy of the object-oriented genetic algorithm is validated by comparing its optimum results with the corresponding results obtained by the nonlinear constrained programming tools“constr”of Matlab through thousands of optimum calculation examples. The results indicate that the deep-searching strategy of the genetic algorithm is valid；and it can get the best optimum result of the problem to the most extent. The programs of optimizing the landslide support structure and deep foundation pit support structure are applied to many practical engineering to check up their performance of optimizing the structure and selecting the reasonable structure type. The result indicates that the single program can well optimize the corresponding structure；and the combined programs can help engineers to select reasonable type of support structure.
