In order to avoid premature convergence and low convergence speed,an improved adaptive genetic algorithm based on niches is presented according to the feature of population fitness distribution.

• 为了避免遗传算法在自动组卷中存在的未成熟收敛和收敛速度慢等弱点,根据群体适应值的分布特点,采用了基于小生境的改进自适应遗传算法。