Abstract: This paper analyzed characters and shortages of existing dynamic load balancing algorithms on server cluster,combined advantages of simulated annealing and dynamic weighted round-robin algorithm to propose a dynamic load balancing model and a solution．The solution uses simulated annealing algorithm to adaptively decide vector of performan-ce weight and uses dynamic round-robin algorithm to balance load based on server load lively．It dynamically distribu-tes requests based on calculated data．Our experiment shows that the dynamic load balancing algorithm effectively ba-lances load and fully utilizes server resources in different load levels.

Key words: Dynamic load-balancing,Server cluster,Simulated annealing,Weighted round-robin