Based on the analysis of Simple genetic algorithm, the paper points out the disadvantages of simple genetic algorithm in the aspects of slow convergence speed and being unable to converge to the optimum solution and puts forward on improved genetic algorithm, that is , multi-species competition genetic algorithm.

Studies on microcystin from population competition aspect;

From population structure, population quantitive variation and distribution, population competition.

In population competition between Callosobruchus maculatus Callosebruchus chinensis and Callosebruchus maculatus was dominant through the experiments of mixing competition, crossing ovipesition and the number of the visual eggs from the ovary of female which emerged under the condition of different number of eggs.