A method for instructing CSI feedback configuration in LTE comprising: a base station side notifying a terminal side, via a first higher layer signaling of a UE-Specific search space, a CSI-RS resource for measuring CSI, wherein the CSI-RS resource comprises at least one of: a time frequency position of the CSI-RS resource in a subframe, aerial port number configuration of the CSI-RS resource, a period and a subframe offset of the CSI-RS resource, a sequence identifier of the CSI-RS resource, and power control information of the CSI-RS resource; and the base station side instructing the terminal side to feed back the CSI corresponding to the CSI-RS resource; wherein the step of the base station side instructing the terminal side to feed back the CSI corresponding to the CSI-RS resource comprises: the base station side dynamically instructing the terminal to select and feedback corresponding CSI via feedback triggering signaling bits in DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling, and/or via a resource position where DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling which belongs to the terminal and is blindly detected by the terminal side is located; wherein the feedback triggering signaling bits in DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling are 2 bits, where 00 represents no CSI of any CSI-RS resource is triggered, and {01, 10, 11} respectively represent triggering CSI of different aggregation modes of CSI-RS resource and/or interference measurement resource, IMR; wherein the resource position where DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling is located comprises at least one of: a starting position of a corresponding Control Channel Element, CCE, a corresponding aggregation level, a corresponding subframe number and a corresponding system frame number and a region instruction of a corresponding higher layer signaling configuration. a base station side notifying a terminal side, via a first higher layer signaling of a UE-Specific search space, a CSI-RS resource for measuring CSI, wherein the CSI-RS resource comprises at least one of: a time frequency position of the CSI-RS resource in a subframe, aerial port number configuration of the CSI-RS resource, a period and a subframe offset of the CSI-RS resource, a sequence identifier of the CSI-RS resource, and power control information of the CSI-RS resource; and the base station side instructing the terminal side to feed back the CSI corresponding to the CSI-RS resource; wherein the step of the base station side instructing the terminal side to feed back the CSI corresponding to the CSI-RS resource comprises: the base station side dynamically instructing the terminal to select and feedback corresponding CSI via feedback triggering signaling bits in DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling, and/or via a resource position where DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling which belongs to the terminal and is blindly detected by the terminal side is located; wherein the feedback triggering signaling bits in DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling are 2 bits, where 00 represents no CSI of any CSI-RS resource is triggered, and {01, 10, 11} respectively represent triggering CSI of different aggregation modes of CSI-RS resource and/or interference measurement resource, IMR; wherein the resource position where DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling is located comprises at least one of: a starting position of a corresponding Control Channel Element, CCE, a corresponding aggregation level, a corresponding subframe number and a corresponding system frame number and a region instruction of a corresponding higher layer signaling configuration. the base station side dynamically instructing the terminal to select and feedback corresponding CSI via feedback triggering signaling bits in DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling, and/or via a resource position where DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling which belongs to the terminal and is blindly detected by the terminal side is located; wherein the feedback triggering signaling bits in DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling are 2 bits, where 00 represents no CSI of any CSI-RS resource is triggered, and {01, 10, 11} respectively represent triggering CSI of different aggregation modes of CSI-RS resource and/or interference measurement resource, IMR; wherein the resource position where DCI Format 0 or DCI format 4 or a random access response or uplink scheduling grant signaling is located comprises at least one of: a starting position of a corresponding Control Channel Element, CCE, a corresponding aggregation level, a corresponding subframe number and a corresponding system frame number and a region instruction of a corresponding higher layer signaling configuration.