An objective of the present invention is to provide a method and apparatus for performing charging control to application-layer data. When a trigger condition is satisfied, a TDF transmits a first credit control request to an OCS, wherein the first credit control request includes a result of inspecting an application or application traffic by the TDF; the OCS determines charging control information for the application or application traffic based on the first credit control request to generate a credit control answer; the OCS transmits the credit control answer to the TDF. Compared with the prior art, in the present invention, the TDF detects an application or application traffic and provides the detection result to the OCS; the OCS determines charging control information to the application or application flow and returns it to the TDF, thereby realizing charging control to the application-layer data and improving the accuracy of the charging system.