A downlink channel time-domain position determination method in coverage enhanced MTC communication, the method comprising: a terminal determining a way for acquiring a time-domain position of a PDCCH or ePDCCH or a time-domain starting position of a PDSCH corresponding to the PDCCH or ePDCCH according to the number of repetitions of resources corresponding to the PDCCH or ePDCCH or a downlink channel type; the terminal acquiring the time-domain position of the PDCCH or ePDCCH or the time-domain starting position of the PDSCH in accordance with the way; wherein, the terminal determining comprises: when the number of repetitions is 1, the terminal acquiring the time-domain position of the PDCCH or ePDCCH or the time-domain starting position of the PDSCH according to a Physical Control Format Indicator Channel, PCFICH; the method characterised in that, when the number of repetitions is greater than 1, and the PDCCH or ePDCCH and the corresponding PDSCH are transmitted in a same subframe, the terminal determining the time-domain position of the PDCCH or ePDCCH or the time-domain starting position of the PDSCH through one of ways of signaling indication, predefinition and blind detection; when the number of repetitions is greater than 1, and the PDCCH or ePDCCH and the corresponding PDSCH are transmitted in different subframes, the terminal determining the time-domain position of the PDCCH or ePDCCH through one of ways of the signaling indication, predefinition and blind detection, and determining the time-domain starting position of the PDSCH through the way of signaling indication or predefinition; wherein, the way of predefinition or blind detection is adopted with regard to a channel with a system public channel type, and the way of signaling indication, predefinition or blind detection is adopted with regard to a channel with a UE-specific channel type, wherein, the signaling indication is borne in a main information block, MIB, transmitted in a physical broadcast channel, PBCH, or borne in a system information block, SIB, transmitted in the PDSCH, and the SIB is obtained by the terminal directly performing the blind detection on the PDSCH; wherein, the way of predefinition is the terminal determining the time-domain position of the PDCCH or ePDCCH and/or the time-domain position of the PDSCH according to at least one of a system bandwidth, a system frame number, a subframe number, a subframe type and a channel type. when the number of repetitions is 1, the terminal acquiring the time-domain position of the PDCCH or ePDCCH or the time-domain starting position of the PDSCH according to a Physical Control Format Indicator Channel, PCFICH; the method characterised in that, when the number of repetitions is greater than 1, and the PDCCH or ePDCCH and the corresponding PDSCH are transmitted in a same subframe, the terminal determining the time-domain position of the PDCCH or ePDCCH or the time-domain starting position of the PDSCH through one of ways of signaling indication, predefinition and blind detection; when the number of repetitions is greater than 1, and the PDCCH or ePDCCH and the corresponding PDSCH are transmitted in different subframes, the terminal determining the time-domain position of the PDCCH or ePDCCH through one of ways of the signaling indication, predefinition and blind detection, and determining the time-domain starting position of the PDSCH through the way of signaling indication or predefinition; wherein, the way of predefinition or blind detection is adopted with regard to a channel with a system public channel type, and the way of signaling indication, predefinition or blind detection is adopted with regard to a channel with a UE-specific channel type, wherein, the signaling indication is borne in a main information block, MIB, transmitted in a physical broadcast channel, PBCH, or borne in a system information block, SIB, transmitted in the PDSCH, and the SIB is obtained by the terminal directly performing the blind detection on the PDSCH; wherein, the way of predefinition is the terminal determining the time-domain position of the PDCCH or ePDCCH and/or the time-domain position of the PDSCH according to at least one of a system bandwidth, a system frame number, a subframe number, a subframe type and a channel type.