A method for a multi-site multi-user joint transmission, comprising: measuring, by a user terminal (UE1, UE2, UE3), a downlink channel (H11, H21, H31) originated from each base station of multiple base stations (eNB1, eNB2, eNB3); according to the measurement for each downlink channel (H 11, H21, H31), quantizing and obtaining, by the user terminal (UE1, UE2, UE3), a per-site channel information for each base station (eNB1, eNB2, eNB3) and an additional inter-site channel information, said additional inter-site channel information being used for calculating a joint channel information for said multiple base stations (eNB1, eNB2, eNB3); and feeding back, by the user terminal (UE1, UE2, UE3), the per-site channel information for each base station (eNB1, eNB2, eNB3) and the additional inter-site channel information so that a base station of said multiple base stations (eNB1, eNB2, eNB3) performs scheduling to execute the multi-site multi-user joint transmission, wherein said per-site channel information comprises a per-site channel direction information and a per-site channel quality information, wherein said additional inter-site channel information comprises an inter-site relative phase information and an inter-site relative amplitude information, wherein said joint channel information comprises a joint channel direction information and a joint channel quality information, characterized in that the additional inter-site channel information further comprises an additional channel quality information, and the joint channel direction information for the multiple base stations is synthesized according to the per-site channel direction information, the inter-site relative phase information and the inter-site relative amplitude information for the multiple base stations (eNB1, eNB2, eNB3). measuring, by a user terminal (UE1, UE2, UE3), a downlink channel (H11, H21, H31) originated from each base station of multiple base stations (eNB1, eNB2, eNB3); according to the measurement for each downlink channel (H 11, H21, H31), quantizing and obtaining, by the user terminal (UE1, UE2, UE3), a per-site channel information for each base station (eNB1, eNB2, eNB3) and an additional inter-site channel information, said additional inter-site channel information being used for calculating a joint channel information for said multiple base stations (eNB1, eNB2, eNB3); and feeding back, by the user terminal (UE1, UE2, UE3), the per-site channel information for each base station (eNB1, eNB2, eNB3) and the additional inter-site channel information so that a base station of said multiple base stations (eNB1, eNB2, eNB3) performs scheduling to execute the multi-site multi-user joint transmission, wherein said per-site channel information comprises a per-site channel direction information and a per-site channel quality information, wherein said additional inter-site channel information comprises an inter-site relative phase information and an inter-site relative amplitude information, wherein said joint channel information comprises a joint channel direction information and a joint channel quality information, characterized in that the additional inter-site channel information further comprises an additional channel quality information, and the joint channel direction information for the multiple base stations is synthesized according to the per-site channel direction information, the inter-site relative phase information and the inter-site relative amplitude information for the multiple base stations (eNB1, eNB2, eNB3).