Myelofibrosis(MF) is a type of myeloprolifirative neoplasms which is difficult to be treated. With the discovery of V617F mutation site in Janus kinase 2 (JAK2), JAK inhibitor provides a new treatment strategy for patients with myelofibrosis. Since 2011 the FDA in USA approved the first generation of JAK inhibitor Ruxolitinib for marketing, a growing number of JAK inhibitors have been entering into the clinical trials and showed a certain clinical efficacy. On the one hand, some JAK inhibitors for single application can effectively relieve the clinical symptoms of patients with myelofibrosis, slow down disease progression, and prolong the survival; on the other hand, JAK inhibitor can also be applied in combination with traditional or other new targeted drugs for MF patients, even during the allogenetic hematopoietic stem cell transplantation, thus providing more choices for targeted therapy on the patients with myelofibrosis. This review focuses mainly on the latest advances of JAK inhibitors for the patients with myelofibrosis.