An uplink channel transmission method in a Time Division Duplex, TDD, system, the method comprising: acquiring from allocation signaling of a resource, by a user equipment, the resource for transmitting an uplink channel allocated from a network side, upon entering a Multiple Input Multiple Output, MIMO, mode; and when each of Transmission Time Intervals, TTIs, comprised in the resource comprises a single uplink timeslot, transmitting by the user equipment the uplink channel alternately over a plurality of antennas sequentially in respective TTIs; wherein for each TTI, the transmitting comprises: determining by the user equipment, from received downlink control channel information transmitted from the network side and a mapping relationship between downlink control channel information and assigned statuses prescribed with a Node B, an antenna for use in the TTI, wherein each of the assigned statuses corresponds to one antenna among the plurality of antennas; and transmitting the uplink channel in the TTI over the determined antenna; wherein the downlink control channel information is: a value of signaling over a downlink channel; or a signaling bit configured over the downlink channel to notify the user equipment about a specific antenna for use; or a System Frame Number of the downlink channel. acquiring from allocation signaling of a resource, by a user equipment, the resource for transmitting an uplink channel allocated from a network side, upon entering a Multiple Input Multiple Output, MIMO, mode; and when each of Transmission Time Intervals, TTIs, comprised in the resource comprises a single uplink timeslot, transmitting by the user equipment the uplink channel alternately over a plurality of antennas sequentially in respective TTIs; wherein for each TTI, the transmitting comprises: determining by the user equipment, from received downlink control channel information transmitted from the network side and a mapping relationship between downlink control channel information and assigned statuses prescribed with a Node B, an antenna for use in the TTI, wherein each of the assigned statuses corresponds to one antenna among the plurality of antennas; and transmitting the uplink channel in the TTI over the determined antenna; wherein the downlink control channel information is: a value of signaling over a downlink channel; or a signaling bit configured over the downlink channel to notify the user equipment about a specific antenna for use; or a System Frame Number of the downlink channel. determining by the user equipment, from received downlink control channel information transmitted from the network side and a mapping relationship between downlink control channel information and assigned statuses prescribed with a Node B, an antenna for use in the TTI, wherein each of the assigned statuses corresponds to one antenna among the plurality of antennas; and transmitting the uplink channel in the TTI over the determined antenna; wherein the downlink control channel information is: a value of signaling over a downlink channel; or a signaling bit configured over the downlink channel to notify the user equipment about a specific antenna for use; or a System Frame Number of the downlink channel. a value of signaling over a downlink channel; or a signaling bit configured over the downlink channel to notify the user equipment about a specific antenna for use; or a System Frame Number of the downlink channel.