Brain metastases （BM） are a common complication of some malignant tumors， and surgery still plays an irreplaceable role as the most traditional method for neurosurgical treatment of cranial tumors. However， there is often a high recurrence rate after conventional total resection of cranial metastases， and an increasing number of clinical and pathological evidence has shown that there are no clear boundaries between these tumors and normal brain tissue， which leads to the development of "supramarginal resection" of brain metastases. It was initially limited to non-functional areas to protect brain function， and now it has been applied to functional areas in combination with the sophisticated tools such as electrophysiological examination， navigation systems， and intraoperative wake-up. Attempts have been made on surgical approach and tumor resection based on the concept of noninvasiveness， so as to achieve an optimal effect between the maximum extent of tumor resection and the maximum preservation of brain function. This article reviews the studies on supramarginal resection of BM and elaborates on the development of this surgical concept. ［Journal of International Neurology and Neurosurgery, 2023, 50(2): 77-81］