The official document transferring among departments has become more complicated and dynamic, and the traditional application architecture has difficulties in handling the situation. Service Oriented Architecture provides a solution. EOS platform is an SOA platform which conforms to SCA/SDO specification. This article introduces the EOS architecture and operation principle, analyses the applicationg requirements of enterprise and public institution on official document managing and brings forward a design and implementation of officail document management system. The system clarifies the document managing steps and helps to improve work efficiency with good extendability and reusability.