| As composite material are widely used in navigation and physical education equipments for high comparing intensity and module, even it has the approxi- mate zero expanding coefficient, as the same time, configuration of composite has been aroused attention by scientific researchers, the goal of them is to find an integrated structure with high efficiency and intelligent and many function all along. Grid structure is the right structure with the high efficiency, the researchers overseas have been studying the structure for many years, which manifests it has many excellent nature; existing research indicate it has higher stiffness and intensity. The form can be detected in health easily for its open shape.So it is appears important to analyse capability of this structure, the people can compute all kinds of complex structure's response under different sorts of exact load on current software, but the source program of the computing question, which is"black box", on the contrary, FEPG can get the source program ,which can provide preference for the optimization of structure, even embed in the optimizing program and save much time of compiling program, linking to GA to identify the load can get the good result. So the problem is solved to alleviate the deadweight and the optimize design of the structure, as well as improve its secure capability.Because of above demands, the program of simulation of response of the impact load is generated by FEPG, Deeply analysis to the program shows the meanings of parameters, function of subroutines and interface files, and compared with the result of experimentation, which indicate the difference is small enough, so can generate the computing source program of the grid structure. As the beginning research of the load identification, this thesis discusses the recognisation of cantilever beam by GA, and the result is well, but the program is limit by number of the parameters. Finally show the path of accuracy improvement.
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