Abstract: The present invention discloses a method of uplink preemption for users in the trunking group, the trunking system network side allocates uplink and downlink group call channels for the group call trunking group, and allocates a dedicated channel for the speaker in the trunking group, the method further comprises: when desiring to speak, a user initiates an UPLINK ACCESS message to the trunking system network side on the allocated group call channel uplink; the trunking system network side which receives the UPLINK ACCESS message releases the dedicated channel allocated for the speaker, and takes the speaker as a listener listening to the group call channel downlink allocated for the trunking group; the trunking system network side allocates a free uplink channel to the user who initiated the UPLINK ACCESS message as his dedicated channel; the user who initiated the UPLINK ACCESS message speaks on the dedicated channel as the current speaker.