A data distribution method, comprising: • receiving, by a communications device, an access policy from a session management function entity, wherein the access policy comprises flow description information of a service data flow, quality information of at least two links, and a data distribution policy of the data flow on the links; • receiving, by the communications device, a service data flow, and if the access policy comprises flow description information of the service data flow, determining, by the communications device, link quality information of a link used for transmitting the service data flow; and • distributing (417; 419), by the communications device, the service data flow on the link according to the data distribution policy, wherein the data distribution policy is a data distribution policy that is determined based on the access policy and that is corresponding to the link quality information and the flow description information of the service data flow, wherein the data distribution policy comprises a distribution ratio of the data flow on the links; wherein, correspondingly, the distributing, by the communications device, the service data flow on the link according to the data distribution policy specifically comprises: sending, by the communications device based on the distribution ratio of the data flow on the links, the service data on the corresponding link, and wherein the data distribution policy further comprises a waiting latency for a receiving party to perform data reordering and reordering, by the communications device, the service data based on the waiting latency. • receiving, by a communications device, an access policy from a session management function entity, wherein the access policy comprises flow description information of a service data flow, quality information of at least two links, and a data distribution policy of the data flow on the links; • receiving, by the communications device, a service data flow, and if the access policy comprises flow description information of the service data flow, determining, by the communications device, link quality information of a link used for transmitting the service data flow; and • distributing (417; 419), by the communications device, the service data flow on the link according to the data distribution policy, wherein the data distribution policy is a data distribution policy that is determined based on the access policy and that is corresponding to the link quality information and the flow description information of the service data flow, wherein the data distribution policy comprises a distribution ratio of the data flow on the links; wherein, correspondingly, the distributing, by the communications device, the service data flow on the link according to the data distribution policy specifically comprises: sending, by the communications device based on the distribution ratio of the data flow on the links, the service data on the corresponding link, and wherein the data distribution policy further comprises a waiting latency for a receiving party to perform data reordering and reordering, by the communications device, the service data based on the waiting latency. sending, by the communications device based on the distribution ratio of the data flow on the links, the service data on the corresponding link, and wherein the data distribution policy further comprises a waiting latency for a receiving party to perform data reordering and reordering, by the communications device, the service data based on the waiting latency.