this paper presents an energy-saving Multi-Ring Cyclic Scheduling for Spatial-TDMA (MRSTDMA). We design a cyclic scheduling of STDMA to realize the energy-saving property of STDMA and overcome the drawbacks of STDMA - reducing TDMA overhead, increasing TDMA throughput, and decreasing End-to-End delay. Besides energy-saving mechanisms, there are initial slot assignment, joining of node, exiting of node, changing slots, and synchronization. Simulation results show that the proposed protocol outperforms the IEEE 802.11 in terms of the amount of energy consumed. The throughput is close to 802.11's, and the packet delivery ratio is near the ratio of 802.11.