Rice straw was cut into fragments of about 0.5 cm. 5 g straw fragments was added into 150 ml conical flask with 30 ml nutrient salt medium and autoclaved (15 min at 121°C). Conidia of a inoculating loop cultured in seed medium for 48 h was prepared for rice straw degradation experiment. The inoculation volume was 10% (v/v) and the whole fermentation process was kept at 30°C for 30 days at 150 rpm. The rate of weight loss was measured through the difference between sample weight of each period and the original weight of straw.