A Physical Downlink Control Channel, PDCCH, blind detection method, characterized in that, the method comprises: detecting power of Resource Elements, REs, occupied by the PDCCH in one subframe and acquiring PDCCH data corresponding to at least some of the REs, wherein power of the at least some of the REs is greater than a preset power threshold and the preset power threshold equals to pilot channel power deducted by radio link power allowance, wherein an identification of position flag is set for each of the at least some REs when said power is greater than the preset power threshold; dividing the PDCCH data into a plurality of groups and acquiring soft bit data for each group of the PDCCH data, wherein PDCCH data in each group corresponds to REs, with identification of position flags set, grouped continuously; starting from a data head of the soft bit data to acquire Control Channel Element, CCE, soft bit data according to different possible aggregation levels of the soft bit data; determining a format of Downlink Control Information, DCI, carried by the PDCCH; subjecting the CCE soft bit data to rate de-matching and convolutional decoding according to the format of the DCI to acquire decoded bit data; performing tail biting convolutional encoding and rate matching on the decoded bit data to acquire rate matched bit data; performing hard decision on the CCE soft bit data to acquire CCE hard bit data; determining whether the rate matched bit data equal to the CCE hard bit data; determining the decoded bit data to be DCI data when the rate matched bit data is equal to the CCE hard bit data, wherein the DCI data comprises DCI bit data and a first Cyclic Redundancy Check, CRC, bit data; computing and acquiring second CRC bit data according to the DCI data; and performing an exclusive or, XOR, operation on both the first and the second CRC bit data to acquire a random access radio network temporary identity to finish PDCCH blind detection. detecting power of Resource Elements, REs, occupied by the PDCCH in one subframe and acquiring PDCCH data corresponding to at least some of the REs, wherein power of the at least some of the REs is greater than a preset power threshold and the preset power threshold equals to pilot channel power deducted by radio link power allowance, wherein an identification of position flag is set for each of the at least some REs when said power is greater than the preset power threshold; dividing the PDCCH data into a plurality of groups and acquiring soft bit data for each group of the PDCCH data, wherein PDCCH data in each group corresponds to REs, with identification of position flags set, grouped continuously; starting from a data head of the soft bit data to acquire Control Channel Element, CCE, soft bit data according to different possible aggregation levels of the soft bit data; determining a format of Downlink Control Information, DCI, carried by the PDCCH; subjecting the CCE soft bit data to rate de-matching and convolutional decoding according to the format of the DCI to acquire decoded bit data; performing tail biting convolutional encoding and rate matching on the decoded bit data to acquire rate matched bit data; performing hard decision on the CCE soft bit data to acquire CCE hard bit data; determining whether the rate matched bit data equal to the CCE hard bit data; determining the decoded bit data to be DCI data when the rate matched bit data is equal to the CCE hard bit data, wherein the DCI data comprises DCI bit data and a first Cyclic Redundancy Check, CRC, bit data; computing and acquiring second CRC bit data according to the DCI data; and performing an exclusive or, XOR, operation on both the first and the second CRC bit data to acquire a random access radio network temporary identity to finish PDCCH blind detection.