|In this study, drying method and the pressure drying method were used to treat 8 kinds of solid wood flooring for ground heating. Take kiln- drying method as a comparison, the effects of pressure drying on the dimensional stability of solid wood flooring for underground heating were evaluated. Moreover, the moisture#br# absorption test was also conducted to explore the mechanism of improving the dimensional stability of solid wood flooring for ground heating. The results showed that pressure drying method could improve the dimensional stability of solid wood flooring for ground heating significantly, but has little effect on the wet-resistant dimensional stability in radial direction. Compared with kiln- drying methods, the shrinkage rate of 4 tree species, namely Pometia spp., Intsia spp., Celtis spp., Quercus spp.of solid wood flooring for ground heating was reduced by 53.8%, 60.0%, 47.1% and 44.4% in radial direction, respectively. Meanwhile, the shrinkage rate in axial direction decreased by 70.9%, 55.6%, 37.0%, 37.5%, respectively, and the expansion rate inaxial direction decreased by 43.2%, 31.8%, 23.4%, and 16.5%, respectively. The improvement of dimensional stability of solid wood flooring for ground heating by pressure drying method is mainly due to the degradation of wood hemicellulose, the increased activity of molecular chain structure and the increase of cellulose crystallization.