MicroRNA(miRNA),about 22 nucleotides in length,is a kind of small RNAs which regulates gene expression post-transcriptionally.Recent studies have demonstrated that miRNAs have a close relationship with nervous system disease,participating in the growth of nervous system,synapse formation and nervous cell differentiation.Autism is a complex neurodevelopmental disorder,and many miRNAs abnormal expressions have been observed in autism.This paper reviews the research progress of miRNAs in autism.