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By measuring resistive current of the Metal-oxide Arresters(MOA) on-line monitoring technology, we can understand the performance condition of MOA at any time without unnecessary power-cut-off overhaul. Thus we can detect the abnormal phenomena and hidden accidents of MOA in time, take measures in advance to prevent the accident from getting worse and to avoid the economic loss resulted from the accident. To conquer the defect of this transmission method, a new method of monitoring of metal-oxide arresters in long distance was presented. The monitoring system consists of on-spot collection module, GPRS transmission module, long-distance monitoring center. The design of hardware and software of TMS320F2812 microprocessor according to the data collection and processing module was introduced. Data report can be formed in this system. The state of MOA can be inspected conveniently and accurately. Electric Power system can run in the reliable state.