A capability opening method and system, and a capability opening functional entity. The method comprises: after receiving a requirement of a third party for a mobile network, acquiring current network information; based on the requirement and the current network information, creating private network networking information, wherein the private network networking information is used for instructing the creation of a private network and/or a private network element; and sending the private network networking information to a network arrangement functional entity. The technical solution of the present invention can solve the problem in the related art that capability opening is limited only to the opening of a present network capability, but cannot provide additional services exceeding the present network capability.