Abstract: The preparation technics of dietary fiber based on Pleurotus djamor (Rumph. : Fr.) Boedijn fruitbodies with enzymic hydrolysis, acid hydrolysis or alkali dissolution were comparatively studied. The advantages and disadvantages of preparation methods were compared, and then the optimum process parameters were drawn. The products made by enzymic hydrolysis shown to have light color, easy bleach, and no strange small. With comprehensive economy and technics. In enzymic hydrolysis, the optimum conditions are: hydrolysis temperature 60 ℃, liquid to solid ratio 12:1 (ml/g), hydrolysis time 2 h, 3 percent papaya of neutal protease, with 60 percent of crude fiber obtained. On the coutrary the products made by acid hydrolysis are of dark color, uneasy bleach, and strange small, so acid hydrolysis is not fit for the manufacture of dietary fiber accordingly. The products made by alkali dissolution are also of dark color, uneasy bleach, though no strange smell.The optimum parameters of alkali dissolution are: 1% sodium hydroxide, liquid to solid ratio10:1 (ml/g), hydrolysis temperature 70 ℃ and hydrolysis time 2 h.

Key words: Pleurotus djamor (Rumph. : Fr.) Boedijn, dietary fiber, extracting, papaya of neutal protease