IntroductionAgaricus blazei Murrill (ABM) is a kind of mushroom which haslong been used as a folk remedy for curing various diseases suchas cancers, heart disease and diabetes in Brazil and Japan. Polysac-charide is one of the main bioactive constituents of Agaricus blazeiMurrill with health functions (Delmanto et al., 2001; Mizuno, 1995).In order to realize all its promising applications, there is a greatdemand to supply the market with high-quality Agaricus blazeiMurrill polysaccharides (ABMP).