Abstract: To improve full searching ability，local searching ability，convergence rate and calculating precision of elementary particle swarm，based on classical PSO（particle swarm optimization） algorithm and quanta theory，this paper proposes an improved PSO algorithm with quantum behavier，WbQPSO algorithm.Indentical particle system is introduced to update the position of particle，chaos thought is introduced to chaotic search every particle and weight coefficient is introduced to Mbest_i，accordingly improving the full searching ability，local searching ability，convergence rate and calculating precision of elementary particle swarm.The experimental results of classical function show that capability of improved algorithm is superior to classical algorithm and quantum-behaved PSO algorithm.