Abstract: A global and local two-level cooperation scheduling (TCS) algorithm is presented. In order to improve the scheduling precision, the global scheduling considers both the service states and system states to choose a suitable site to serve; Based on the global scheduling, the local scheduling adjusts the service quality and service states to guarantee no rejection of client request, and feeds back the service states to improve the correctness of global scheduling. The theoretical and simulated results show that, with the similar efficiency, the proposed algorithm owns higher reliability compared with the traditional distributed scheduling algorithms.