Chronic myeloid leukemia (CML) is a myeloproliferative tumor whose pathogenesis is related to the BCR/ABL fusion gene. Tyrosine kinase inhibitors (TKIs) can significantly improve the survival and prognosis of CML patients. Nilotinib is effective in first-line treatment of CML patients with rapid response, deep remission and high safety. After achieving a sustained deep molecular response, it is a new therapeutic goal for CML to stop the use of nilotinib and achieve treatment-free remission. In addition, due to disease resistance and mutations, how to start new treatments after nilotinib treatment failure is worth further research.