Government decision-making is a complex and comprehensive problem. It needs to make judgments and develop policies combining with professional advices and supports on the base of the comprehensive analysis of all aspects of the data, the integrated consideration of existing conditions and development prospects and other factors. Therefore, the construction of government decision-making information system should be taken the solving of the information sharing and the collaboration between departments as the main target. However, the existing government decision-support information systems are mostly focused on auxiliary analysis of information, and information sharing and collaboration between different departments are still lacking. This paper proposes to build a government decision-making support and collaboration applications platform for network-based data sharing and multi-sectoral collaboration on the base of service-oriented architecture (SOA) technology. This paper designs a service-based system framework with three-layer structure, and models this platform based on unified modeling language (UML). According to this, a service-based major function oriented zoning decision support system has been achieved for major function oriented zoning application. The results show that the service-based platform design was better in the solution of distributed information sharing and users’ collaboration issues.