Abstract: Based on the research of domain model and domain analysis, next generation network service conceptual model (NGNSCM) was proposed to facilitate the service development in next generation network（NGN）. Some key issues of NGNSCM, such as feature and component decoupling, component abstract, design and organization, were specified. Application in the design of application server in NGN verifies the feasibility of NGNSCM.

Key words: domain model, domain analysis, feature, software reuse, next generation network, application server