In order to improve pyrolysis efficiency of oil shale, a high-efficiency scheme of coal-assisted oil shale pyrolysis is proposed. Syngas produced by coal gasification is burned to provide heat for the pyrolysis of oil shale. The new scheme is modelled and simulated in our work. On this basis, the technical and economic performance of the whole process is analyzed; then a comparison is made between the new process and the existing Fushun-type oil shale pyrolysis process. The research results indicate that: 1) 375 t/h oil shale pyrolysis needs 149.6 MW of heat. The pyrolysis gas generated by the pyrolysis of the oil shale provides 60% of the heat after being combusted completely. The remaining 40% is provided by burning syngas from coal gasification. 2) In terms of economic performance, the product cost of the new process is 2636 CNY/t, which is 12% lower than that of the conventional process. 3) The current oil price is stable around 50 $/bbl, and the price of crude oil from the economical competitiveness of new pyrolysis process is 51 $/bbl. Compared with the 58 $/bbl of the conventional Fushun pyrolysis process, it has obvious economic competitiveness. <摘要译文>