关键词: 人口迁移算法, 高斯变异, 最速下降算法, 全局优化

Abstract: Population Migration Algorithm（PMA） is a new optimization technique originating from the simulation of population migration.The algorithm mainly simulates population transition with economics and dispersion with population pressure increase.To enhance convergence rate and global convergence ability，a new improved algorithm is proposed by adding Gaussian mutation and the steepest descent algorithms，whose convergence is proved.Experimental results indicate the improved algorithm has good behavior both improving global convergence ability and enhancing convergence rate.

Key words: Population Migration Algorithm（PMA）, Gaussian mutation, the steepest descent algorithms, global optimization