A transmission method for a downlink control channel, comprising: performing, by a terminal, a blind detection on the downlink control channel according to a maximum number of candidates in a repeated transmission, wherein the maximum number of candidates in the repeated transmission is represented by N total, and N_total meets one of the following conditions: N_total≤N_legacy, wherein N_legacy represents a maximum blind detection number of a single subframe of a transmission terminal of a long-term evolution, LTE, system; N_total is N_legacy×Y, wherein Y represents a maximum number of types of repeat times for performing the blind detection on the downlink control channel; and N_total ranges from N_legacy to N_legacy×Y; wherein a principle of allocating the number of the candidates to Y types of repeat times comprises the following: when Y is greater than 1, the number of the candidates for a first repeat times is greater than the number of the candidates for a second repeat times, and the first repeat times is less than the second repeat times; wherein each of the repeat times in the Y types of repeat times detected at least corresponds to one candidate, wherein N_legacy is selected from a group formed by the following: a maximum number of blind detections performed with respect to a UE-specific search space, USS, merely; a maximum number of blind detections performed with respect to a common search space, CSS, merely; and a maximum number of blind detections performed with respect to the USS and the CSS, wherein a maximum number of types of aggregation levels used for performing detection on the downlink control channel is X, wherein X is an integer greater than or equal to 1, and Y is an integer greater than or equal to 1. performing, by a terminal, a blind detection on the downlink control channel according to a maximum number of candidates in a repeated transmission, wherein the maximum number of candidates in the repeated transmission is represented by N total, and N_total meets one of the following conditions: N_total≤N_legacy, wherein N_legacy represents a maximum blind detection number of a single subframe of a transmission terminal of a long-term evolution, LTE, system; N_total is N_legacy×Y, wherein Y represents a maximum number of types of repeat times for performing the blind detection on the downlink control channel; and N_total ranges from N_legacy to N_legacy×Y; N_total≤N_legacy, wherein N_legacy represents a maximum blind detection number of a single subframe of a transmission terminal of a long-term evolution, LTE, system; N_total is N_legacy×Y, wherein Y represents a maximum number of types of repeat times for performing the blind detection on the downlink control channel; and N_total ranges from N_legacy to N_legacy×Y; wherein a principle of allocating the number of the candidates to Y types of repeat times comprises the following: when Y is greater than 1, the number of the candidates for a first repeat times is greater than the number of the candidates for a second repeat times, and the first repeat times is less than the second repeat times; wherein each of the repeat times in the Y types of repeat times detected at least corresponds to one candidate, wherein N_legacy is selected from a group formed by the following: a maximum number of blind detections performed with respect to a UE-specific search space, USS, merely; a maximum number of blind detections performed with respect to a common search space, CSS, merely; and a maximum number of blind detections performed with respect to the USS and the CSS, wherein a maximum number of types of aggregation levels used for performing detection on the downlink control channel is X, wherein X is an integer greater than or equal to 1, and Y is an integer greater than or equal to 1.