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介绍了遗传算法的基本原理和应用特点，提出了加入生长算子的改进措施，并且通过在工程结构优化设计中的应用实例，证明了改进后的遗传算法可以明显提高解题速度和解的最优性．
The basic principle and application characteristics of genetic algorithm are introduced. The improvement measures of adding growth operator are proposed. And through the application examples in the optimization design of engineering structure, it is proved that the improved genetic algorithm can obviously improve the optimal solution speed Sex.