The invention discloses a resource optimal management method aiming at a clustering system. The method includes: integrating nodes into different queues; distributing tasks into different queues; determining a task completing sequence by calculating priority of the tasks; when there are nodes which are occupied while in an idle state, enabling the idle nodes to pick other tasks to complete according to different strategies. By the method, by flexibly calling and arranging of the idle nodes inside the system, the objectives of increasing utilization rate of the nodes in the clustering system and improving overall efficiency of the clustering efficiency are achieved.