A Control Channel Element, CCE, detection method of a mobile station using a Channel Quality Indicator, CQI, in a wireless communication system, comprising: searching a current subframe for CCEs; and locating the CCEs carrying control information for the mobile station by decoding the current subframe, wherein the searching the current subframe for the CCEs comprises searching the current subframe for the CCEs carrying the control information for the mobile station while selecting a searching order for a size type of the CCEs according to a result of comparison between a CQI of the current subframe and a CQI of a previous subframe, wherein the size type is indicative of a number of CCEs used for transmitting a Physical Downlink Control CHannel, PDCCH, and an aggregation level, wherein locating the CCEs further comprises determining whether the current subframe includes a scheduling grant for the mobile station, and characterized in that, searching the current subframe for the CCEs further comprises: comparing the CQI of the current subframe with the previous CQI; begin searching (607, 608), when the current CQI is greater than the previous CQI, for CCEs with a size type less than a size type of CCEs of the previous subframe in the current subframe; or begin searching (617, 618), when the current CQI is equal to or less than the previous CQI, for CCEs with a size type greater than the size type of the CCEs of the previous subframe in the current subframe. searching a current subframe for CCEs; and locating the CCEs carrying control information for the mobile station by decoding the current subframe, wherein the searching the current subframe for the CCEs comprises searching the current subframe for the CCEs carrying the control information for the mobile station while selecting a searching order for a size type of the CCEs according to a result of comparison between a CQI of the current subframe and a CQI of a previous subframe, wherein the size type is indicative of a number of CCEs used for transmitting a Physical Downlink Control CHannel, PDCCH, and an aggregation level, wherein locating the CCEs further comprises determining whether the current subframe includes a scheduling grant for the mobile station, and characterized in that, searching the current subframe for the CCEs further comprises: comparing the CQI of the current subframe with the previous CQI; begin searching (607, 608), when the current CQI is greater than the previous CQI, for CCEs with a size type less than a size type of CCEs of the previous subframe in the current subframe; or begin searching (617, 618), when the current CQI is equal to or less than the previous CQI, for CCEs with a size type greater than the size type of the CCEs of the previous subframe in the current subframe. comparing the CQI of the current subframe with the previous CQI; begin searching (607, 608), when the current CQI is greater than the previous CQI, for CCEs with a size type less than a size type of CCEs of the previous subframe in the current subframe; or begin searching (617, 618), when the current CQI is equal to or less than the previous CQI, for CCEs with a size type greater than the size type of the CCEs of the previous subframe in the current subframe.