Specimens of Poplar （Populus xeuramericana Guinier CI.’San Martino’ and P. Deltoides Bartr CI.’Lux’） and Chinese Fir （Cunninghamia lanceolata） were measured and weighed. They were then impregnated with PF resin, surface compressed and then again measured and weighed. The results showed that with the increase in resin concentration, the weight percent gain （WPG）, anti-shrink efficiency （ASE） and moisture excluding efficiency （MEE） of the treated wood increased proportionally, while its tangential and radial shrinking ratio decreased. When the resin concentration was lower, the changes of all the above indexes appeared more pronounced and tended to be stable until a certain level. The compression deformation recovery rate of the treated wood was slight when the resin concentration exceeded 10%, which meant that the compressive （deformation） was almost constant for wood.