A method for determining the transmission bandwidth of an uplink sounding reference signal, comprising the following steps performed by a user equipment, UE: determining whether Sounding Reference Signal, SRS, is transmitted with an uplink pilot time slot when the UE is informed to transmit the SRS with the largest bandwidth level; transmitting the SRS with a non-extensive SRS bandwidth if the SRS is determined to be transmitted with the uplink pilot time slot and the UE reaches a power limit, wherein if the UE reaches the power limit, a signaling indication is received from a base station and indicates that the SRS is transmitted with the non-extensive bandwidth. the largest bandwidth level comprises: an indication of the largest SRS bandwidth level received from a network side before transmitting the SRS with the uplink pilot time slot each time; or a stored indication of the largest SRS bandwidth level, which is an indication of the largest SRS bandwidth level received from the network side, and the non-extensive SRS bandwidth is determined by any one of the table from Table 1 to Table 4 as follow: Table 1. SRS bandwidth when 6 ≤ N RB UL ≤ 40 SRS bandwidth configuration SRS bandwidth b=0 m SRS,b 0 36 1 32 2 24 3 20 4 16 5 12 6 8 7 4 Table 2. SRS bandwidth when 40 < N RB UL ≤ 60 SRS bandwidth configuration SRS bandwidth b=0 m SRS,b 0 48 1 48 2 40 3 36 4 32 5 24 6 20 7 16 Table 3. SRS bandwidth when 60 < N RB UL ≤ 80 SRS bandwidth configuration SRS bandwidth b=0 m SRS,b 0 72 1 64 2 60 3 48 4 48 5 40 6 36 7 32 Table 4. SRS bandwidth when 80 < N RB UL ≤ 110 SRS bandwidth configuration SRS bandwidth b=0 m SRS,b 0 96 1 96 2 80 3 72 4 64 5 60 6 48 7 48 wherein N RB UL is a overall uplink bandwidth represented by as a number of resource blocks, b=0 represents the largest bandwidth level, m SRS,b represents the bandwidth with which the SRS is transmitted with unit in resource blocks, and the SRS bandwidth configuration comprises cell-level SRS bandwidth configuration. determining whether Sounding Reference Signal, SRS, is transmitted with an uplink pilot time slot when the UE is informed to transmit the SRS with the largest bandwidth level; transmitting the SRS with a non-extensive SRS bandwidth if the SRS is determined to be transmitted with the uplink pilot time slot and the UE reaches a power limit, wherein if the UE reaches the power limit, a signaling indication is received from a base station and indicates that the SRS is transmitted with the non-extensive bandwidth. the largest bandwidth level comprises: an indication of the largest SRS bandwidth level received from a network side before transmitting the SRS with the uplink pilot time slot each time; or a stored indication of the largest SRS bandwidth level, which is an indication of the largest SRS bandwidth level received from the network side, and the non-extensive SRS bandwidth is determined by any one of the table from Table 1 to Table 4 as follow: Table 1. SRS bandwidth when 6 ≤ N RB UL ≤ 40 SRS bandwidth configuration SRS bandwidth b=0 m SRS,b 0 36 1 32 2 24 3 20 4 16 5 12 6 8 7 4 Table 2. SRS bandwidth when 40 < N RB UL ≤ 60 SRS bandwidth configuration SRS bandwidth b=0 m SRS,b 0 48 1 48 2 40 3 36 4 32 5 24 6 20 7 16 Table 3. SRS bandwidth when 60 < N RB UL ≤ 80 SRS bandwidth configuration SRS bandwidth b=0 m SRS,b 0 72 1 64 2 60 3 48 4 48 5 40 6 36 7 32 Table 4. SRS bandwidth when 80 < N RB UL ≤ 110 SRS bandwidth configuration SRS bandwidth b=0 m SRS,b 0 96 1 96 2 80 3 72 4 64 5 60 6 48 7 48 an indication of the largest SRS bandwidth level received from a network side before transmitting the SRS with the uplink pilot time slot each time; or a stored indication of the largest SRS bandwidth level, which is an indication of the largest SRS bandwidth level received from the network side, and the non-extensive SRS bandwidth is determined by any one of the table from Table 1 to Table 4 as follow: Table 1. SRS bandwidth when 6 ≤ N RB UL ≤ 40 SRS bandwidth configuration SRS bandwidth b=0 m SRS,b 0 36 1 32 2 24 3 20 4 16 5 12 6 8 7 4 Table 2. SRS bandwidth when 40 < N RB UL ≤ 60 SRS bandwidth configuration SRS bandwidth b=0 m SRS,b 0 48 1 48 2 40 3 36 4 32 5 24 6 20 7 16 Table 3. SRS bandwidth when 60 < N RB UL ≤ 80 SRS bandwidth configuration SRS bandwidth b=0 m SRS,b 0 72 1 64 2 60 3 48 4 48 5 40 6 36 7 32 Table 4. SRS bandwidth when 80 < N RB UL ≤ 110 SRS bandwidth configuration SRS bandwidth b=0 m SRS,b 0 96 1 96 2 80 3 72 4 64 5 60 6 48 7 48 wherein N RB UL is a overall uplink bandwidth represented by as a number of resource blocks, b=0 represents the largest bandwidth level, m SRS,b represents the bandwidth with which the SRS is transmitted with unit in resource blocks, and the SRS bandwidth configuration comprises cell-level SRS bandwidth configuration.