Abstract: The bottom water spontaneous imbibition experimental device was adopted to test the imbibition height of remolded coal under different pressing loads (porosity).The imbibition height of remolded coal without gas was calculated and analyzed through the theory of rising height of capillary absorbent, and the variation law of limit imbibition height was obtained.The results showed that, at the same ratio of particles, the porosity decreased with the increasing pressing load, following the law of negative exponent, at first the imbibition height increased rapidly, then increaseds slowly; At the same time, the smaller the porosity (the greater the pressing load), the higher the imbibition height; At the same pressing load, the smaller the porosity, the higher the imbibition height.The imbibition rate of remolded coal is the biggest in the first period of time, but it gradually decreases to 0 with the time going, and the imbibition height exists limit value.At the same ratio of particles, the limit imbibition height of the remolded coal without gas increases rapidly with the decrease of the porosity (the increase of the pressing load), and then increases gradually.The limit imbibition height of remolded coal without gas is negatively correlated with the porosity.