A method for processing physical downlink control channel data, comprising: generating (S101) a scrambling sequence corresponding to a control channel element according to an index number of the control channel element and/or a modulation mode used by the control channel element; performing (S102) scrambling on physical downlink control channel data by using the scrambling sequence; and sending (S103) the scrambled physical downlink control channel data to a user equipment. characterized in that the generating (S101) a scrambling sequence corresponding to a control channel element according to an index number of the control channel element and/or a modulation mode used by the control channel element comprises: generating a specific long sequence for the user equipment according to a UE_Specific parameter; and extracting the scrambling sequence corresponding to the control channel element in the specific long sequence, wherein a length of the scrambling sequence corresponds to a data length corresponding to the modulation mode used by the control channel element of the user equipment; wherein a physical downlink channel carrying the physical downlink control channel data is located in a subframe within which there are a plurality of control channel elements , wherein the physical downlink channel comprises at least one control channel element, and at least two control channel elements with different index numbers of the plurality of control channel elements have different numbers of resource elements. generating (S101) a scrambling sequence corresponding to a control channel element according to an index number of the control channel element and/or a modulation mode used by the control channel element; performing (S102) scrambling on physical downlink control channel data by using the scrambling sequence; and sending (S103) the scrambled physical downlink control channel data to a user equipment. characterized in that the generating (S101) a scrambling sequence corresponding to a control channel element according to an index number of the control channel element and/or a modulation mode used by the control channel element comprises: generating a specific long sequence for the user equipment according to a UE_Specific parameter; and extracting the scrambling sequence corresponding to the control channel element in the specific long sequence, wherein a length of the scrambling sequence corresponds to a data length corresponding to the modulation mode used by the control channel element of the user equipment; wherein a physical downlink channel carrying the physical downlink control channel data is located in a subframe within which there are a plurality of control channel elements , wherein the physical downlink channel comprises at least one control channel element, and at least two control channel elements with different index numbers of the plurality of control channel elements have different numbers of resource elements. generating a specific long sequence for the user equipment according to a UE_Specific parameter; and extracting the scrambling sequence corresponding to the control channel element in the specific long sequence, wherein a length of the scrambling sequence corresponds to a data length corresponding to the modulation mode used by the control channel element of the user equipment; wherein a physical downlink channel carrying the physical downlink control channel data is located in a subframe within which there are a plurality of control channel elements , wherein the physical downlink channel comprises at least one control channel element, and at least two control channel elements with different index numbers of the plurality of control channel elements have different numbers of resource elements. <EOS>