Downlink signal monitoring and transmitting method, and parameter configuration method and apparatus. The method includes: monitoring a downlink signal by a terminal equipment according to an antenna port quasi-co-location parameter; wherein the antenna port quasi-co-location parameter is related to a first cell and/or a second cell, or is related to a first reference signal index and a second reference signal index. Hence, even though a network device configures multiple carriers for the terminal equipment, the terminal equipment may be able to accurately determine an antenna port quasi-co-location parameter for receiving a downlink signal.