A charging control method, comprising: generating, by a charging trigger apparatus CTF, a resource quota request according to a trigger condition; and sending the resource quota request to an online charging system OCS, so that the OCS determines a quota type and the number of quota of the quota type after receiving the resource quota request, and allocates a quota for the resource quota request according to the quota type and number determined by the OCS; where: the quota type and number are determined by the OCS according to the resource quota request; wherein the generating, by a CTF, a resource quota request according to a trigger condition comprises: after the trigger condition is met, if the CTF determines that a first message that carries a service unit type is received from a policy and charging control module PCRF, wherein the service unit type is used to indicate a quota type to be carried in the resource quota request to be generated by the CTF, determining, by the CTF, the number of quota of the quota type according to the service unit type; and generating a resource quota request according to the service unit type and the number of quota, wherein the resource quota request comprises the quota type indicated by the service unit type and the number of quota of the quota type. generating, by a charging trigger apparatus CTF, a resource quota request according to a trigger condition; and sending the resource quota request to an online charging system OCS, so that the OCS determines a quota type and the number of quota of the quota type after receiving the resource quota request, and allocates a quota for the resource quota request according to the quota type and number determined by the OCS; where: the quota type and number are determined by the OCS according to the resource quota request; wherein the generating, by a CTF, a resource quota request according to a trigger condition comprises: after the trigger condition is met, if the CTF determines that a first message that carries a service unit type is received from a policy and charging control module PCRF, wherein the service unit type is used to indicate a quota type to be carried in the resource quota request to be generated by the CTF, determining, by the CTF, the number of quota of the quota type according to the service unit type; and generating a resource quota request according to the service unit type and the number of quota, wherein the resource quota request comprises the quota type indicated by the service unit type and the number of quota of the quota type. the quota type and number are determined by the OCS according to the resource quota request; wherein the generating, by a CTF, a resource quota request according to a trigger condition comprises: after the trigger condition is met, if the CTF determines that a first message that carries a service unit type is received from a policy and charging control module PCRF, wherein the service unit type is used to indicate a quota type to be carried in the resource quota request to be generated by the CTF, determining, by the CTF, the number of quota of the quota type according to the service unit type; and generating a resource quota request according to the service unit type and the number of quota, wherein the resource quota request comprises the quota type indicated by the service unit type and the number of quota of the quota type. after the trigger condition is met, if the CTF determines that a first message that carries a service unit type is received from a policy and charging control module PCRF, wherein the service unit type is used to indicate a quota type to be carried in the resource quota request to be generated by the CTF, determining, by the CTF, the number of quota of the quota type according to the service unit type; and generating a resource quota request according to the service unit type and the number of quota, wherein the resource quota request comprises the quota type indicated by the service unit type and the number of quota of the quota type.