Abstract: In order to discuss the vitrain and fusain hydrogen liquefaction difference and cause, rich vitrain and rich fusain samples were picked by hands from the collected coal samples.The hydrogen liquefaction experiments and the infrared spectrum analysis were conducted with the rich vitrain and rich fusain samples.The lique faction experiment results showed that the oil production rate and conversion rate of the vitrain would be higher than the fusain.The spectrum graphical pile subprogram of the WIN-IR software was applied to the infrared spectrum individual peak simulation of the vitrain and fusain.The analysis showed that in comparison with the fusain, the aromatic hydrogen content of the vitrain would be lower and the aliphatic hydrogen content of the vitrain would be higher.Therefore this is the important cause that t he liquefaction conversion rate and oil production rate of the vitrain would higher than the fusain.The content of the fusain oxygen-containing function groups would be higher than the vitrain and would be main influence factors that the CO2 and CO in the fusain liquefied gas products could be higher than the vitrain.The liquefied water production rate of the vitrain and fusain would be approximately equal and due to the partial reason, the hydroxy| strength of the vitrain and fusain would be approximat ely same.