Abstract: Load balancing in grid is different from traditional distributed system because of scalability，heterogeneity of computing resources and considerable transfer delay.In this paper，a dynamic and decentralized load balancing algorithm is presented.The processing power and transfer delay are considered in this algorithm.The algorithm is an instantaneous distribution policy that are performance driven to minimize execution cost.The objective of the load balancing algorithm is to minimize the average job response time.The simulation results show that the algorithm deeply reduces the average job response time.