Embodiments of this application provide a registration method and apparatus based on a service-based architecture. In this method, a management network element determines configuration information of a function network element, where the configuration information includes a security parameter; and the management network element sends the configuration information to the function network element. The function network element receives the configuration information sent by the management network element; and the function network element sends a registration request to a control network element based on the configuration information, where the registration request includes the security parameter. The control network element receives the registration request sent by the function network element, where the registration request includes the security parameter; and the control network element verifies correctness of the security parameter, and determines validity of the registration request based on the correctness of the security parameter. In this way, the control network element performs security authentication on the registration request of the function network element, thereby improving security.
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