An aperiodic channel quality information sending method comprising: a mobile terminal and network side pre-appointing one or more transmission modes which support the forming of dual flow beam, and aperiodic channel quality information CQI feedback mode(s) corresponding to the transmission modes; the network side indicating the mobile terminal one pre-appointed transmission mode to be adopted; and when the mobile terminal receiving the indication of adopting the one pre-appointed transmission mode, the mobile terminal adopting the aperiodic CQI feedback mode corresponding to the one pre-appointed transmission mode to feed back the CQI information to the network side; wherein in the step of feeding back the CQI information to the network side, the mobile terminal also adopts the aperiodic CQI feedback mode corresponding to the one pre-appointed transmission mode to feed back the pre-coding information PMI to the network side; wherein the step of the mobile terminal and the network side pre-appointing one or more transmission modes which support the forming of dual flow beam, and aperiodic channel quality information CQI feedback mode corresponding to the transmission modes comprises: the mobile terminal and the network side pre-appointing that a transmission mode 4 supports the forming of dual flow beam which needs the pre-coding information feedback and the closed loop multiplexing, and a transmission mode 8 supports the forming of dual flow beam which does not need the pre-coding information feedback, wherein the aperiodic CQI feedback mode of the transmission mode 4 is the feedback mode 1-2, the feedback mode 2-2 or the feedback mode 3-1, and the aperiodic CQI feedback mode of the transmission mode 8 is the feedback mode 2-0 or the feedback mode 3-0; the step of adopting the aperiodic CQI feedback mode corresponding to the one pre-appointed transmission mode to feed back the CQI information to the network side comprises: adopting the feedback mode 1-2, the feedback mode 2-2 or the feedback mode 3-1 to feed back the CQI information, the rank RI information and the PMI of each flow when the one pre-appointed transmission mode is transmission mode 4; or adopting the feedback mode 2-0 or the feedback mode 3-0 to feed back the CQI information of the first flow when the one pre-appointed transmission mode is transmission mode 8; wherein the transmission mode 4, the feedback mode 2-0, the feedback mode 3-0, the feedback mode 1-2, the feedback mode 2-2 and the feedback mode 3-1 are defined in the LTE system, and the transmission mode 8 is pre-appointed to support the forming of dual flow beam which does not need the pre-coding information feedback; wherein the contents of transmission mode 4 are modified in the LTE physical layer criteria. a mobile terminal and network side pre-appointing one or more transmission modes which support the forming of dual flow beam, and aperiodic channel quality information CQI feedback mode(s) corresponding to the transmission modes; the network side indicating the mobile terminal one pre-appointed transmission mode to be adopted; and when the mobile terminal receiving the indication of adopting the one pre-appointed transmission mode, the mobile terminal adopting the aperiodic CQI feedback mode corresponding to the one pre-appointed transmission mode to feed back the CQI information to the network side; wherein in the step of feeding back the CQI information to the network side, the mobile terminal also adopts the aperiodic CQI feedback mode corresponding to the one pre-appointed transmission mode to feed back the pre-coding information PMI to the network side; wherein the step of the mobile terminal and the network side pre-appointing one or more transmission modes which support the forming of dual flow beam, and aperiodic channel quality information CQI feedback mode corresponding to the transmission modes comprises: the mobile terminal and the network side pre-appointing that a transmission mode 4 supports the forming of dual flow beam which needs the pre-coding information feedback and the closed loop multiplexing, and a transmission mode 8 supports the forming of dual flow beam which does not need the pre-coding information feedback, wherein the aperiodic CQI feedback mode of the transmission mode 4 is the feedback mode 1-2, the feedback mode 2-2 or the feedback mode 3-1, and the aperiodic CQI feedback mode of the transmission mode 8 is the feedback mode 2-0 or the feedback mode 3-0; the step of adopting the aperiodic CQI feedback mode corresponding to the one pre-appointed transmission mode to feed back the CQI information to the network side comprises: adopting the feedback mode 1-2, the feedback mode 2-2 or the feedback mode 3-1 to feed back the CQI information, the rank RI information and the PMI of each flow when the one pre-appointed transmission mode is transmission mode 4; or adopting the feedback mode 2-0 or the feedback mode 3-0 to feed back the CQI information of the first flow when the one pre-appointed transmission mode is transmission mode 8; wherein the transmission mode 4, the feedback mode 2-0, the feedback mode 3-0, the feedback mode 1-2, the feedback mode 2-2 and the feedback mode 3-1 are defined in the LTE system, and the transmission mode 8 is pre-appointed to support the forming of dual flow beam which does not need the pre-coding information feedback; wherein the contents of transmission mode 4 are modified in the LTE physical layer criteria.