Methods for data transmission, user equipment and a network device are provided. The method includes: User Equipment (UE) transmits data to a network device by using a first uplink transmission waveform on a first beam; the UE receives a first indication message transmitted by the network device, the first indication message is used for indicating an uplink transmission waveform corresponding to at least one beam; and the UE transmits data to the network device by using a second uplink transmission waveform on a second beam of the at least one beam, the second uplink transmission waveform is an uplink transmission waveform corresponding to the second beam indicated in the first indication message.