Voltage-gated sodium channel Na_V1.9 is preferentially expressed in peripheral nociceptors and plays an important role in the generation and propagation of elec. signals in nerves.Animal models and genetic studies have shown that it plays a major role in inflammatory pain, neuropathic pain and cold allodynia.Therefore, Na_V1.9 is a potential target for analgesics.Here, we review recent studies that reveal the relationship between Na_V1.9 and pain.Na_V1.9's expression location, physiol. characteristics, animal models, genetic validation in humans and pharmacol. study, and the development of targeted analgesics were discussed, to provide reference for the further research of the role of Na_V1.9 in pain.