A physical sidelink feedback channel, PSFCH, sending method, wherein the method comprises: receiving, by a first terminal apparatus, first sidelink data from a second terminal apparatus, wherein a transmission resource of the first sidelink data comprises N resource elements, and N is a positive integer; determining, by the first terminal apparatus, a feedback resource based on the transmission resource of the first sidelink data, wherein the feedback resource is used to transmit sidelink feedback control information, SFCI, and the feedback resource comprises N resource elements; and when X resource elements are required for sending first feedback information, and X is less than N, sending, by the first terminal apparatus, at least one piece of SFCI to the second terminal apparatus on the feedback resource through at least one PSFCH, wherein the SFCI comprises the first feedback information, and the first feedback information is used to indicate whether the first terminal apparatus correctly receives the first sidelink data; wherein the sending, by the first terminal apparatus, at least one piece of SFCI to the second terminal apparatus on the feedback resource through at least one PSFCH comprises: sending, by the first terminal apparatus, first SFCI to the second terminal apparatus on the feedback resource through a first PSFCH, and sending second SFCI to the second terminal apparatus through a second PSFCH, wherein a resource size of the first PSFCH is the same as a size of the X resource elements comprised in the first feedback information, and a resource size of the second PSFCH is the same as a resource size obtained by subtracting the X resource elements comprised in the first feedback information from the N resource elements comprised in the feedback resource; and the first SFCI comprises the first feedback information, and the second SFCI comprises one or more of channel state information and receiving terminal measured assistance information RMAI. receiving, by a first terminal apparatus, first sidelink data from a second terminal apparatus, wherein a transmission resource of the first sidelink data comprises N resource elements, and N is a positive integer; determining, by the first terminal apparatus, a feedback resource based on the transmission resource of the first sidelink data, wherein the feedback resource is used to transmit sidelink feedback control information, SFCI, and the feedback resource comprises N resource elements; and when X resource elements are required for sending first feedback information, and X is less than N, sending, by the first terminal apparatus, at least one piece of SFCI to the second terminal apparatus on the feedback resource through at least one PSFCH, wherein the SFCI comprises the first feedback information, and the first feedback information is used to indicate whether the first terminal apparatus correctly receives the first sidelink data; wherein the sending, by the first terminal apparatus, at least one piece of SFCI to the second terminal apparatus on the feedback resource through at least one PSFCH comprises: sending, by the first terminal apparatus, first SFCI to the second terminal apparatus on the feedback resource through a first PSFCH, and sending second SFCI to the second terminal apparatus through a second PSFCH, wherein a resource size of the first PSFCH is the same as a size of the X resource elements comprised in the first feedback information, and a resource size of the second PSFCH is the same as a resource size obtained by subtracting the X resource elements comprised in the first feedback information from the N resource elements comprised in the feedback resource; and the first SFCI comprises the first feedback information, and the second SFCI comprises one or more of channel state information and receiving terminal measured assistance information RMAI. sending, by the first terminal apparatus, first SFCI to the second terminal apparatus on the feedback resource through a first PSFCH, and sending second SFCI to the second terminal apparatus through a second PSFCH, wherein a resource size of the first PSFCH is the same as a size of the X resource elements comprised in the first feedback information, and a resource size of the second PSFCH is the same as a resource size obtained by subtracting the X resource elements comprised in the first feedback information from the N resource elements comprised in the feedback resource; and the first SFCI comprises the first feedback information, and the second SFCI comprises one or more of channel state information and receiving terminal measured assistance information RMAI.