Abstract: In this paper, the pyrolysis experiments of Dayan lignite, Xiezhuang bituminous coal and Xiyang anthracite carry out slowly at the atmosphere of N2, in order to study the effect of different kinds of coal on the transferred law of carbon, it is helpful to calculate the quantity of carbon reacting at the gasification phase in mass balance model of UCG. The results show that: in the pyrolysis process, the transferred law of carbon is related to coal rank, a(C, gasification carbon) is the carbon content ratio of gasification carbon to raw coal, and the average of a(C, gasification carbon) for anthracite is 93.19%, it is bigger than lignite and bituminous coal, the average of which is both 78%, but the carbon content ratio for other pyrolysis productions is very little and the range is between 0 and 1%; for lignite and bituminous coal the maximum of a(C,tar) is 10.36% and 14.53% at 600℃; a(C,CH4) and a(C,C2H4) are related to volatiles content in raw coal, for bituminous coal they are both greater than lignite; a(C,CO) and a(C,CO2) are related to oxygen content in raw coal, for lignite they are both greater than bituminous coal; the nitrogen and sulfur element are existed inactively in the bituminous coal, so a(C,COS) for bituminous coal is less than lignite, and the rising rate of a(C,HCN) for bituminous coal decreases gradually.