A credit control method performed by an Online Charging system, OCS, comprising: receiving a first request sent by a policy and charging enforcement function entity, PCEF, wherein the first request instructs to perform credit control on a first bearer; and sending a first answer to the PCEF, wherein the first answer carries a credit pool identifier corresponding to the first bearer; receiving a second request sent by the PCEF, wherein the second request instructs to perform credit control on a second bearer; determining, according to the second request, whether a service borne by the second bearer may share the credit pool with a service borne by the first bearer, wherein the second bearer is established after the first bearer is established; and if the service borne by the second bearer may share the credit pool with the service borne by the first bearer, sending a second answer to the PCEF, wherein the second answer carries the credit pool identifier corresponding to the first bearer, so that the service borne by the first bearer shares the credit pool with the service borne by the second bearer; wherein the sending a first answer to the PCEF, wherein the first answer carries a credit pool identifier corresponding to the first bearer, comprises: allocating the first quota to the first bearer; and sending a first answer to the PCEF, wherein the first answer carries the first quota and the credit pool identifier corresponding to the first bearer; and wherein the receiving a second request sent by the PCEF specifically comprises: receiving the second request sent by the policy and charging enforcement function entity PCEF by using a second Gy session; the sending a second answer to the PCEF, specifically comprises: sending the second answer to the PCEF by using the second Gy session; the receiving a first request sent by the policy and charging enforcement function entity PCEF, specifically comprises: receiving the first request sent by the policy and charging enforcement function entity PCEF by using a first Gy session; and the sending a first answer to the PCEF, specifically comprises: sending the first answer to the PCEF by using the first Gy session; wherein the first Gy session and the second Gy session are different Gy sessions, or the first Gy session and the second Gy session are a same shared Gy session; and wherein the first bearer and the second bearer belong to a same Internet Protocol connectivity access network session IP-CAN session; or the first bearer belongs to a first IP-CAN session, and the second bearer belongs to a second IP-CAN session, wherein the first IP-CAN session and the second IP-CAN session are different. receiving a first request sent by a policy and charging enforcement function entity, PCEF, wherein the first request instructs to perform credit control on a first bearer; and sending a first answer to the PCEF, wherein the first answer carries a credit pool identifier corresponding to the first bearer; allocating the first quota to the first bearer; and sending a first answer to the PCEF, wherein the first answer carries the first quota and the credit pool identifier corresponding to the first bearer; and receiving the second request sent by the policy and charging enforcement function entity PCEF by using a second Gy session; the sending a second answer to the PCEF, specifically comprises: sending the second answer to the PCEF by using the second Gy session; the receiving a first request sent by the policy and charging enforcement function entity PCEF, specifically comprises: receiving the first request sent by the policy and charging enforcement function entity PCEF by using a first Gy session; and the sending a first answer to the PCEF, specifically comprises: sending the first answer to the PCEF by using the first Gy session;