Abstract:Small RNAs are small, endogenous and non-coding RNAs and rich in eukaryotes, they regulate the gene expression through complete or non-complete complementary with the mRNA. In this review, we summarized the discovered classes of fungal small RNAs, protein factors biogenesis related with small RNAs, and provide a current analysis of the small RNAs mechanisms. This will provide the important reference for the scientists to further study the mechanisms of fungal small RNAs in growth and development.