The present disclosure provides a method and a User Equipment (UE) supporting transmission power adjustment. The UE first receives a first signaling, and then transmits a first wireless signal. A first modulation symbol sequence is used to generate the first wireless signal; the first modulation symbol sequence employs a target waveform; a first bit block is used to generate the first modulation symbol sequence; the first signaling is used to determine the target waveform out of X waveforms; a transmitting power of the first wireless signal is a first power; at least one of an upper bound of the first power and the first power is related to the target waveform. The method can adjust the UE transmitting power according to the waveform of the uplink transmission, thus reducing the power loss of the UE or improving the coverage performance of the uplink transmission.