Phenol formaldehyde resin （PF） is used widely in water resistant wood based panel manufacturing in China, but its above 100 ℃ curing temperature and long pressing time result in low productivity. This study focused on Poplar flakeboards using aqueous phenol formaldehyde resin （PF） by steam injection vacuum pressing（SIVP） . Comparing the processing parameters and quality indexes of board by SIVP with that in conventional techniques, the results showed that by SIVP, the board pressing time could be shorten to 35% of that in conventional pressing; some physical and mechanical properties of the boards could be improved: the thickness swelling （ TS ） was decreased by 33%, the internal bond strength （ IB ） increased about 15%, formaldehyde emission of the board was reduced by 24%. But the bending property of board was reduced significantly. The board had higher core density with more uniform density profile.