Abstract: The thermochemistry selective liquefaction of bamboo powder in phenol was carried out under lower temperature and lower acid-catalyzed concentration. The structural modification of bamboo powder before and after liquefaction via phenol was investigated with FTIR, WXRD, SEM and TGA, respectively. The results showed that the component of bamboo powder was degraded partially and new substitutes being produced during the phenolic process of bamboo powder; the amorphous parts among bamboo cellulose and lignin were liquefied completely, while the cellulose with higher crystalline was non-liquefied；the phenolated solution with good fluidity and bamboo-fibre powder with better heat stability were obtained finally. The liquefaction mechanism was also discussed.

Key words: bamboo powder, selective liquefaction, bamboo-fibre powder, mechanism