In this paper, the Genetic Algorithm is briefly introduced and is applied to the optimizing blades installation arrangement order so as to decrease the imbalance magnitude due to .

Through the research and analysis of Secondary development kits and its principle based on UG,and the parametric design and the research to the steam turbine s blade frock s three-dimensional model,the paper introduces the principle of components parametric design by operating the UG part families using VC++.