A transmission method and a configuration method for a downlink control channel, a terminal, a base station and a computer storage medium are provided. The transmission method for the downlink control channel includes: performing, by a terminal, a blind detection on the downlink control channel according to a maximum number (N_total) of candidates in a repeated transmission. The N_total meets one of the following conditions: the N_total is not greater than a total number N_legacy of candidates of a single subframe of a transmission terminal (legacy UE) of a long-term evolution (LTE) system; the N_total is N_legacy×Y which is a product of the N_legacy and a maximum value Y of types of repeat times for performing the blind detection on the downlink control channel; and the N_total ranges from the N_legacy to theN_legacy×Y.