Abstract: ‍ ‍Brain-computer interface （BCI） is to establish a communication and control channel between the brain and the external environment that does not depend on the peripheral nervous system， so as to realize the direct interaction between the brain and external devices. The original intention of BCI is to help patients with movement disorders directly control auxiliary equipment with their intentions， improve the quality of life of patients and regain their confidence in life. With the development of BCI technology， BCI application has expanded to the fields of game entertainment， learning and education， smart home and military. As an important part of brain science and brain-inspired intelligence research， BCI has become the strategic focus of science and technology in many countries. With the rapid development of brain science， computing science， artificial intelligence and other fields， the pace of progress in BCI technology has accelerated， and BCI has become a hot spot at the forefront of global science and technology. BCI technology mainly involves hardware， software， and algorithms. The hardware mainly includes acquisition and processing apparatuses for brain signal， which are the prerequisites for ensuring the BCI performance. software optimization will lower the threshold for using the BCI and benefit more individuals. Algorithms are mainly to analyze and process brain signals to accurately and quickly interpret user intentions. The technical progress of BCI in hardware， software and algorithm will not only promote BCI from laboratory demonstration to practical application， but will also broaden the scope of BCI application. Therefore， this article reviewed and sorted out the hotspots in the field of BCI in 2022 from the aspects of key technologies and typical applications， in order to enhance the understanding of the current status of BCI research. At the same time， it summarized and looked forward to the current development of BCI technology， hoping to provide useful reference and inspiration for researchers in the BCI field.