[Objective] This study aimed to purify and characterize proteases from Aspergillus oryzae. [Methods] Ammonium sulfate precipitation, DEAE-Sepharose FF anion exchange chromatography, Phenyl-Sepharose HP hydrophobic chromatography and Superdex-G75/200 gel filtration chromatography were used to purify the proteases from A. oryzae. The molecular weight and purity were determined by SDS-PAGE, and the enzymatic hydrolyzates of soy protein isolated were assayed by HPLC. [Results] Two proteases(P1 and P2) were obta...