The combination of proteins and polysaccharides showed the excellent properties than they used alone,it affects flavor,nutrition,and texture of food system.Now,the research of polysaccharides /protein complexes is becoming a hot-spot for investigators in the world.By using konjac glucomannan as a representative polysaccharides,the physical,chemical and biological modification of konjac glucomannan /protein complexes as well as the change of modified composite' function were reviewed and the modified mechanisms were also discussed in the hope of providing a reference for other polysaccharide /protein complexes.