Implant maxillary sinus lifting is a kind of operation to improve the problem of maxillary height deficiency and alveolar bone atrophy. The risk of postoperative infection is mainly related to wound hygiene, immunity, antibiotic use and other factors. About three days after operation, the wound is in recovery period, and its immunity is relatively weak, so it is easy to be infected. At this time, we should pay special attention to oral hygiene and use antibiotics in time to reduce the risk of infection.