In this study, effects of coal liquefaction parameters on the removal of oxygen, the higher heating value of char, and soluble products during the catalyst physically mixing or impregnation of the two Turkish lignites were investigated. According to the results, the effects on the higher heating value of char and the soluble products of the reaction parameters were almost similar for both lignites. In the case of catalysts physically mixing, the higher heating value of total soluble products of Beypazari lignite increased as a result of increase in solvent/coal ratio and temperature. In the case of the catalyst physically mixing and impregnation of Tuncbilek lignite, the higher heating value of char and the soluble products was observed to have increased considerably at 350 - 400 degrees C of the reaction temperature in 10 - 60 minutes of reaction time. According to the results of FT- I. R., it was observed that functional groups with oxygen ( carboxylic, carbonyl and etheric) were decreased or removed completely, depending on the liquefaction conditions.