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Many power management solutions are adapted for Cluster system. But the solutions are quite complicated and hard to adapt it for the system. In this paper, the simple algorithm and policy for the user in cluster system are introduced. This policy is based on system load and time and operates dynamically according to the policy. The controllable items are CPU frequency and system state from ACPI because the common servers and computers have the function of DVFS and ACPI. The solution consists of three tier system level: the managed node, proxy master and master node. This system has 10% to 50% power saving results depending on system status.