Nowadays, implementation of interoperability in eGoverment services become more important and larger,. As of reference, interoperability is connection of different systems, information and schema of working, in among different administrations which running together and could be applied around the world. Interoperability is implemented in eGoverment with various form that distintive each other. Interoperability is very important in supporting eGoverment for achieving a good service. eGoverment applied interoperability schema to give a lot of service for the citizen and to acheve a one-stop government in a country. In addition, eGovrment services based interoperability is a part requirement for designing and implementing variuos eGovernment applications for certain goal. Today, Interoperability composed of heterogenity and dynamic data sources in a transaction. Therefore, in this paper we propose a novel approach to solve interoperability in eGoverment services with heterogeneous data source by using adaptive ontology schema. © 2015 IEEE.