This application relates to the field of communications technologies, and in particular, to a policy management method and system, and an apparatus. The method includes: requesting, by a policy decision entity, an NFVO in a management domain of a composite NS to perform a management operation on a policy group. According to the solution provided in this application, consistency between the LCM policy of the composite NS and the LCM policy of the nested NS forming the composite NS is ensured, and policy management execution efficiency is improved in a scenario of providing a composite NS across management domains.