The present invention discloses a method for truncating a service period, a network controller, and a station. The method includes: determining allocation control information of an service period, where the allocation control information includes a truncation indication and a truncation type indication; and sending the allocation control information to a station, so that the station uses the service period to perform communication, and truncates the service period according to a truncation type indicated by the truncation type indication when the service period is surplus and the truncation indication indicates that the service period can be truncated. According to the method for truncating a service period, the network controller, and the station in embodiments of the present invention, interference to communication after the service period is truncated can be reduced.