The supply of wood is only depended on importation in Taiwan, so it is difficult to get cheaper wood material for pulp and paper industry. Polyester fiber (PET) is artificial fiber refined from petroleum and has affinity for oil. It can improve the oil adsorptivity of thin papers and is abundant in Taiwan. So adding PET into wood fiber to produce papers can decrease the cost and improve the oil adsorptivity of papers. The subject of this study is to discuss the effect on water absorptivity. Oil absorptivity: strength and so on of oil absorption papers which were added with PET fiber by different ratios. Two kinds of handsheets were produced, one only made of wood fibers by different ratios of softwood pulp (NBKP) and hardwood pulp (LBKP), the other was made of wood fibers and PET fibers by different ratios. By carrying on these experiments there will be an optimal one show up.