A method for detecting and receiving a downlink control channel, comprising: determining, by a User Equipment, UE, a first detection time parameter indicated by a network side device for detection and reception of the downlink control channel; and selecting, by the UE, a corresponding downlink control channel time domain resource according to the first detection time parameter to detect and receive the downlink control channel, wherein the first detection time parameter is used to indicate a detecting and receiving time frequency of the downlink control channel, and the selecting, by the UE, the corresponding downlink control channel time domain resource according to the first detection time parameter to detect and receive the downlink control channel comprises: detecting and receiving, by the UE, the downlink control channel on the corresponding downlink control channel time domain resource, according to the detecting and receiving time frequency indicated by the first detection time parameter, characterized in that: the first detection time parameter indicates one of N predetermined detecting and receiving time frequencies by using ceil(log 2) bits, N being the quantity of the predetermined detecting and receiving time frequencies, wherein each of the detecting and receiving time frequencies is used to indicate the UE to detect and receive the downlink control channel once on every M symbols, M being an integer greater than or equal to 1; or the first detection time parameter indicates the detecting and receiving time frequency of the downlink control channel by using 1 bit, wherein in a case that the 1 bit has a first value, the first detection time parameter indicates the detection and reception to be performed once in each slot for the downlink control channel, and in a case that the 1 bit has a second value, the first detection time parameter indicates the detection and reception to be performed once on each symbol for the downlink control channel. determining, by a User Equipment, UE, a first detection time parameter indicated by a network side device for detection and reception of the downlink control channel; and selecting, by the UE, a corresponding downlink control channel time domain resource according to the first detection time parameter to detect and receive the downlink control channel, wherein the first detection time parameter is used to indicate a detecting and receiving time frequency of the downlink control channel, and the selecting, by the UE, the corresponding downlink control channel time domain resource according to the first detection time parameter to detect and receive the downlink control channel comprises: detecting and receiving, by the UE, the downlink control channel on the corresponding downlink control channel time domain resource, according to the detecting and receiving time frequency indicated by the first detection time parameter, characterized in that: the first detection time parameter indicates one of N predetermined detecting and receiving time frequencies by using ceil(log 2) bits, N being the quantity of the predetermined detecting and receiving time frequencies, wherein each of the detecting and receiving time frequencies is used to indicate the UE to detect and receive the downlink control channel once on every M symbols, M being an integer greater than or equal to 1; or the first detection time parameter indicates the detecting and receiving time frequency of the downlink control channel by using 1 bit, wherein in a case that the 1 bit has a first value, the first detection time parameter indicates the detection and reception to be performed once in each slot for the downlink control channel, and in a case that the 1 bit has a second value, the first detection time parameter indicates the detection and reception to be performed once on each symbol for the downlink control channel. the first detection time parameter indicates one of N predetermined detecting and receiving time frequencies by using ceil(log 2) bits, N being the quantity of the predetermined detecting and receiving time frequencies, wherein each of the detecting and receiving time frequencies is used to indicate the UE to detect and receive the downlink control channel once on every M symbols, M being an integer greater than or equal to 1; or the first detection time parameter indicates the detecting and receiving time frequency of the downlink control channel by using 1 bit, wherein in a case that the 1 bit has a first value, the first detection time parameter indicates the detection and reception to be performed once in each slot for the downlink control channel, and in a case that the 1 bit has a second value, the first detection time parameter indicates the detection and reception to be performed once on each symbol for the downlink control channel.