Provided are methods for determining a transmission parameter of an uplink signal, a terminal and a network device. The method includes that: a terminal determines a first SRS resource set receives, from a network device, first indication information which is for instructing the terminal to transmit an aperiodic SRS, determines a target SRS resource set according to the first indication information and the first SRS resource set, sends the aperiodic SRS to the network device on an SRS resource in the target SRS resource set, receives, from the network device, second indication information which is for indicating a target SRS resource in the target SRS resource set; and the terminal determines a transmission parameter used to transmit an uplink signal according to the target SRS resource.