A downlink data packet configuration method applied to a base station, comprising: determining a target data radio bearer, DRB, corresponding to a downlink data packet to be sent; determining, according to a pre-configured correspondence between a DRB and a downlink processing attribute, a target downlink processing attribute corresponding to the target DRB, wherein the target downlink processing attribute comprises one of: an attribute indicating supporting a non-access stratum, NAS, reflective quality of service, QoS, function, an attribute indicating supporting an access stratum, AS, reflective QoS function, or an attribute indicating no support for both the NAS reflective QoS function and the AS reflective QoS function; encapsulating the downlink data packet by adding a service data adaptation protocol, SDAP, header when determined that the target downlink processing attribute indicates supporting the NAS reflective QoS function or the AS reflective QoS function; encapsulating the downlink data packet without adding the SDAP header when determined that the target downlink processing attribute indicates no support for both the NAS reflective QoS function and the AS reflective QoS function; sending the pre-configured correspondence between the DRB and the downlink processing attribute to a terminal through a radio resource control, RRC, configuration message, and causing the terminal to store the pre-configured correspondence between the DRB and the downlink processing attribute; and sending the encapsulated downlink data packet to the terminal. determining a target data radio bearer, DRB, corresponding to a downlink data packet to be sent; determining, according to a pre-configured correspondence between a DRB and a downlink processing attribute, a target downlink processing attribute corresponding to the target DRB, wherein the target downlink processing attribute comprises one of: an attribute indicating supporting a non-access stratum, NAS, reflective quality of service, QoS, function, an attribute indicating supporting an access stratum, AS, reflective QoS function, or an attribute indicating no support for both the NAS reflective QoS function and the AS reflective QoS function; encapsulating the downlink data packet by adding a service data adaptation protocol, SDAP, header when determined that the target downlink processing attribute indicates supporting the NAS reflective QoS function or the AS reflective QoS function; encapsulating the downlink data packet without adding the SDAP header when determined that the target downlink processing attribute indicates no support for both the NAS reflective QoS function and the AS reflective QoS function; sending the pre-configured correspondence between the DRB and the downlink processing attribute to a terminal through a radio resource control, RRC, configuration message, and causing the terminal to store the pre-configured correspondence between the DRB and the downlink processing attribute; and sending the encapsulated downlink data packet to the terminal. an attribute indicating supporting a non-access stratum, NAS, reflective quality of service, QoS, function, an attribute indicating supporting an access stratum, AS, reflective QoS function, or an attribute indicating no support for both the NAS reflective QoS function and the AS reflective QoS function; encapsulating the downlink data packet by adding a service data adaptation protocol, SDAP, header when determined that the target downlink processing attribute indicates supporting the NAS reflective QoS function or the AS reflective QoS function; encapsulating the downlink data packet without adding the SDAP header when determined that the target downlink processing attribute indicates no support for both the NAS reflective QoS function and the AS reflective QoS function; sending the pre-configured correspondence between the DRB and the downlink processing attribute to a terminal through a radio resource control, RRC, configuration message, and causing the terminal to store the pre-configured correspondence between the DRB and the downlink processing attribute; and sending the encapsulated downlink data packet to the terminal.