Abstract: Coal liquefaction was important way of energy structure adjustment in some country with rich coal but oil shortage, but also an important component of clean coal technology. Biomass liquefaction was an important measure of harmonious development about new energy development with environmental protection in rural or urban. Exploring coliquefaction of coal with biomass, it was a new thinking of harmonious development about energy development with environmental protection, and it has an important significance for the establishment of energy-saving and environment-friendly society. First, coal liquefaction, biomass liquefaction and Coliquefaction about coal with biomass has been studied in this paper, then the problems of Coliquefaction of coal with biomass were raised, and finally the proposal of author were made about the development direction of coliquefaction of coal with biomass.