Abstract: In order to get high quality and yield coal tar,taking Yulin long flame coal as research object,the paper investigated the products yield,char strength and coal tar properties under different prolysis temperature using 1 kg / h external heated rotary furnace.The results showed that,the rising temperature aggravated the pyrolysis,the gas and liquid products yield increased,the char yield decreased.With the rise of temperature,the yield of water yield increased slightly,the char structural strength and aperture also raised.The higher the temperature,the better-developed pore structure.The aliphatic and aromatic content were proportional to the temperature,while the polar composition was inversely proportional to the temperature.The optimum prolysis temperature was 600 ℃ for long flame coal,the maximum coal tar yield was 8.66%,which was 79.5% of Gray-King yield.The semi-coke strength was greater than 78% when the polar composition was 32.9% and the aliphatic and aromatic content was more than 50%.