Abstract: According to low overall efficiency,low driving motor efficiency,low power factor of power supply line and other problems whenthe scraper conveyor was in li ght load or no load operation,the frequency converter of scraper conveyor was researched and developed andthe control strategy and technology of online frequency conv erted speed regulation in the scraper conveyor was on operation process was de-veloped according to the load variation. The paper analyzed the energy saving method an d technical access in the operation of conveyor. Anunderground industrial trial with a period of 6 months was conducted in Dongqu Mine of Shanxi Xishan Coal and Electric Power CompanyLimited. An underground electric energy metering method was applied to measure and record the accumulated electric power,power factorand other operat ion parameters of the scraper conveyor under two modes of the converter working frequency and the online frequency con-verted speed relation. The data results showed t hat with the application of the online frequency converted speed regulation to the scraperconveyor,the electric power saving rate of the coal transportation per ton could be 15% ~ 20%.