In this article, low temperature pyrolysis upgrading experiment was conducted with the low rank coal from Shanyin, Shanxi. The influence of temperature and holding time on the product yield and properties was investigated by tube furnace. The results showed that the optimized pyrolysis temperature of the experiment was 500~550 ℃，and holding time was 60 minutes. The semi-coke yield of the low rank coal was high, the sulfur content decreased significantly, and the desulfurization rate was up to 55%. The volatile matter, high ash content and higher heating value can meet the requirements of clean coal quality index in Beijing-Tianjin-Hebei region, and it can be used as clean fuel for heating, heating and so on. The tar yield was high, the density of tar was low, and the light oil component content was high. So, high quality fuel oil can be obtained through hydrogenation. The gas yield was high, and H ₂ can be gotten using the produced gas as raw material by pressure swing adsorption technology.