The present invention provides a debugging system, which is embedded on a forwarding path of a module and includes a service flow matching module and a service flow debug execution module. The service flow matching module receives and analyzes a message, and determines a service flow type and a debugging mean involving the message according to a dynamic service flow type association table, wherein the dynamic service flow type association table includes a corresponding service flow type and a corresponding debugging mean involving the message. The service flow debug execution module executes the corresponding debugging means for the message according to a determination result from the service flow snatching module.