Abstract:Filamentous microorganisms are important biocatalysts for the fermentation industry．They usually present three types of mycelial morphology in submerged cultivation: dispersed mycelium，clumps and pellet，which have an important relationship with the product quality and yield．This paper summarizes the effect of mycelial morphology on the fermentation results as well as the effect of adding microparticles on mycelial morphology，mycelial structure and fermentation yield during the fermentation process of filamentous microorganisms．