The invention relates to a service invoking method for a mobile network, and a service gateway, a service platform and a system thereof. The method comprises the following steps: receiving a service capability invoking request which comprises a message body for bearing the service data and a message header for identifying the service data attribute; analyzing the message header, determining the service enabler corresponding to the service capability invoking request, and forwarding the request to the service enabler. The system comprises a service platform and a service gateway which comprises an interface module, an analysis module and an invoking module. By using the invention, the processing links and works can be reduced, the same processing mechanism can be adopted for various service capabilities, so that the running efficiency can be improved. Simultaneously, when a new service capability is accessed, the service gateway can support the new service capability without being upgraded, thereby reducing the operating cost.