Currently, it is the cultivation season of Black fungus in Suifenhe City, Heilongjiang Province. It is introduced that in last harvest season, the price of Black fungus got risen, mushroom farmers who saw the prospect future increased the cultivation efforts of Black fungus in succession. Sawdust, the raw material in Black fungus cultivation became in short supply. To take brich coarse particle sawdust as an example, its price per ton jumped 30% from a year earlier, which has risen the production costs of Black fungus.