A method for Hybrid Automatic Repeat reQuest, HARQ, feedback indication, for applying to a base station, the method comprising: determining present downlink data to be sent to User Equipment, UE; generating uplink HARQ feedback indication information for the present downlink data, a timing relationship indicated by the uplink HARQ feedback indication information being comprised in a set of first timing relationships between time-domain units where downlink data for the UE are located and time-domain units for uplink HARQ feedback of the downlink data; and sending the present downlink data and Downlink Control Information, DCI, carrying the uplink HARQ feedback indication information to the UE; characterized in that the method further comprises: receiving capability information reported by the UE; in response to determining, according to the capability information, that the UE supports dynamic HARQ feedback, generating a generation rule, wherein the generation rule is used for generating the set of first timing relationships by using a predefined set of second timing relationships between time-domain units where downlink data supported by a present system are located and the time-domain units for the uplink HARQ feedback of the downlink data, and the set of first timing relationships is a subset of the set of second timing relationships; and sending, to the UE, the generation rule for generating, at the UE, the set of first timing relationships according to the generation rule and the set of second timing relationships. determining present downlink data to be sent to User Equipment, UE; generating uplink HARQ feedback indication information for the present downlink data, a timing relationship indicated by the uplink HARQ feedback indication information being comprised in a set of first timing relationships between time-domain units where downlink data for the UE are located and time-domain units for uplink HARQ feedback of the downlink data; and sending the present downlink data and Downlink Control Information, DCI, carrying the uplink HARQ feedback indication information to the UE; characterized in that the method further comprises: receiving capability information reported by the UE; in response to determining, according to the capability information, that the UE supports dynamic HARQ feedback, generating a generation rule, wherein the generation rule is used for generating the set of first timing relationships by using a predefined set of second timing relationships between time-domain units where downlink data supported by a present system are located and the time-domain units for the uplink HARQ feedback of the downlink data, and the set of first timing relationships is a subset of the set of second timing relationships; and sending, to the UE, the generation rule for generating, at the UE, the set of first timing relationships according to the generation rule and the set of second timing relationships. receiving capability information reported by the UE; in response to determining, according to the capability information, that the UE supports dynamic HARQ feedback, generating a generation rule, wherein the generation rule is used for generating the set of first timing relationships by using a predefined set of second timing relationships between time-domain units where downlink data supported by a present system are located and the time-domain units for the uplink HARQ feedback of the downlink data, and the set of first timing relationships is a subset of the set of second timing relationships; and sending, to the UE, the generation rule for generating, at the UE, the set of first timing relationships according to the generation rule and the set of second timing relationships.