Influence of pressure upon the elemental balance of rapid pyrolysis of Taiheiyo coal was investigated. Relationship between carbon conversions to the whole gas, C_G, and to char showed that condensates was formed at the initial stage of pyrolysis and then it decomposed to gas and char. Oxygen and hydrogen conversions to the whole gas increased with C_G and attained around 100% and 80% at C_G≒26% respectively. Amount of CH_4 was in proportion to that of CO_2 and the relationship between shift reaction and CH_4 formation was presumed.
