The simulation grid has become a very important research topic. In order to ensure the QoS of resource management, we present a control mechanism in simulation grid, which is based on the prediction methods. In the control mechanism, we first introduce our resource management module in simulation grid. Then, we propose a resource allocation algorithm. In order to justify the feasibility and the availability of this control mechanism, a series of experiments have been done. The results show that it is feasible to schedule the system resources and control the QoS of system resources for tasks in simulation grid.