Pulmonary hypertension(PH) is a progressive disease characterized by pulmonary vascular remodeling. Current treatments for PH remain suboptimal, and there is an urgent need to better decipher the underlying pathomechanisms in order to find new therapeutic targets. miRNA(microRNA) are key components in the post-transcriptional machinery that mediate cellular functions mainly by regulating the expression of downstream target genes. Numerous in vivo and in vitro studies have demonstrated the involvement of miRNA and their regulators in PH development. However, there is no unified conclusion about the mechanism of miRNA regulation of pulmonary vascular remodeling. Therefore, this article provides a review on the mechanisms of miRNA in PH in recent years.