PSFCH sending method and apparatus

A PSFCH sending method and an apparatus are provided, and relate to V2X, an intelligent vehicle, autonomous driving, an intelligent connected vehicle, and the like. The method may include: a first terminal apparatus receives first sidelink data from a second terminal apparatus, and determines, based on a transmission resource of the first sidelink data, a feedback resource used to send SFCI. The transmission resource of the first sidelink data and the feedback resource include N resource elements, and N is a positive integer. When X resource elements are required for sending first feedback information, and X is less than N, the first terminal apparatus sends at least one piece of SFCI to the second terminal apparatus on the feedback resource through at least one PSFCH. The SFCI includes the first feedback information, and the first feedback information indicates whether the first terminal apparatus correctly receives the first sidelink data.