Poplar wood was pretreated with white rot fungi then pulped with kraft method. The result showedthat both white rot fungus C.v. 1 (Coriolus versicolor No.1)and C.v. 2 (Coriolus versicolor No.2)were very capable of decomposing lignin of wood but the former was stronger than the later. The experimental result of pulping and paper making showed that paper made of biotreated poplar wood had better physico mechanical properties than that of untreated poplar wood. Moreover, cooking time of biotreated wood was decreased by 50% compared with untreated poplar wood.