A method and an apparatus for determining a data flow rate on a service access port are provided. The method includes: acquiring data traffic information of existing service access ports; classifying the service access ports according to the data traffic information of the service access ports, and determining a data traffic model of a service access port of each class; and when it is determined that a new service access port is to be added to a network, determining a data traffic model corresponding to the new service access port that is to be added, and determining, according to the data traffic model corresponding to the new service access port that is to be added, a data flow rate on the new service access port that is to be added, thus costs of determining a data flow rate on a new service data port to be added can be reduced.