Today, the implementation of eGovernment services in many countries become larger. Interoperability is how to interlink different systems and different schema of working in among different administrations when eGovernment services run a number of applications. Furthermore, the interoperability can be implemented in all over the world. The interoperability, a concept that supports eGovernment interlinking, is used to achieve a good service of eGovernment accessed by public. When the application of eGovernment is growing, the quality of services becomes an important aspect. However, various data and systems will cause problems among them, such as different field names in the database, different tables and so on. Therefore, in this paper, we propose a model for achieving good Quality of Service (QoS) for eGovernment services. We propose an adaptive ontology method to get high QoS in eGovernment services with heterogenity data and information.