The invention relates to a method for constructing an end system protocol stack in a network with a construction function and a method for accessing an end system to a service carrying network. Through extension and construction of an application layer and a reconfigurable polymorphic network layer, the end system protocol stack oriented to a reconfigurable network is constructed in the mode that an application program interface of the reconfigurable network is additionally arranged in the application layer, correct accessing of the end system to the reconfigurable network and communication between the end system and the reconfigurable network are achieved. The method for accessing the end system with the protocol stack to the service carrying network includes the steps that (1) a request of the end system is described and transmitted; (2) the request of the end system is analyzed; (3) the service carrying network meeting the conditions of the request of the end system is inquired; (4) a result of the inquired service carrying network is processed, and network identities, access points and networking protocol lists of the service carrying network are obtained; (5) the end system runs corresponding software components to conduct instantiation on needed networking protocols; (6) the end system is accessed to the service carrying network through the access points of the service carrying network according to the network identities, obtained in the step, of the service carrying network, and end-to-end data communication is achieved.