A method for determining transmit power of an uplink signal, comprising: Receiving (S33), by a terminal device , a message sent by a network device , wherein the message carries a first loss parameter related to a first uplink carrier and a second loss parameter related to a second uplink carrier; Calculating (S34), by the terminal device , transmit power of an uplink signal, wherein the uplink signal is sent on the first uplink carrier, and the transmit power of the uplink signal is calculated based on the first loss parameter related to the first uplink carrier; or the uplink signal is sent on the second uplink carrier, and the transmit power of the uplink signal is calculated based on the second loss parameter related to the second uplink carrier; Sending (S51), by the terminal device , a maximum power information to the network device ; wherein the first loss parameter is a first power ramping factor, the second loss parameter is a second power ramping factor, and values of the first power ramping factor and the second power ramping factor are different; and the calculating, by the terminal device , transmit power of an uplink signal comprises: when sending the uplink signal on the first uplink carrier, calculating, by the terminal device , the transmit power of the uplink signal based on the first power ramping factor; or when sending the uplink signal on the second uplink carrier, calculating, by the terminal device , the transmit power of the uplink signal based on the second power ramping factor. Receiving (S33), by a terminal device , a message sent by a network device , wherein the message carries a first loss parameter related to a first uplink carrier and a second loss parameter related to a second uplink carrier; Calculating (S34), by the terminal device , transmit power of an uplink signal, wherein the uplink signal is sent on the first uplink carrier, and the transmit power of the uplink signal is calculated based on the first loss parameter related to the first uplink carrier; or the uplink signal is sent on the second uplink carrier, and the transmit power of the uplink signal is calculated based on the second loss parameter related to the second uplink carrier; Sending (S51), by the terminal device , a maximum power information to the network device ; wherein the first loss parameter is a first power ramping factor, the second loss parameter is a second power ramping factor, and values of the first power ramping factor and the second power ramping factor are different; and the calculating, by the terminal device , transmit power of an uplink signal comprises: when sending the uplink signal on the first uplink carrier, calculating, by the terminal device , the transmit power of the uplink signal based on the first power ramping factor; or when sending the uplink signal on the second uplink carrier, calculating, by the terminal device , the transmit power of the uplink signal based on the second power ramping factor. when sending the uplink signal on the first uplink carrier, calculating, by the terminal device , the transmit power of the uplink signal based on the first power ramping factor; or when sending the uplink signal on the second uplink carrier, calculating, by the terminal device , the transmit power of the uplink signal based on the second power ramping factor. <EOS>