Abstract: The National Climate Center (NCC) of China Meteorological Administration (CMA) was founded in January 1995, and now NCC has developed into a national operational and research center of climate in China,involving climate monitoring and diagnosis, climate prediction, climate impact assessment as well as climate change. Based on these basic responsibilities and its capabilities of the variable running operational systems, NCC has provided kinds of climate services both for government and publics. Since NCC is a young national team for climate operations, the status of the current operational system in NCC is unsystematic and inefficient, and most work need to be done manually. Compared with weather operational system liking Micaps (Meteorological Information Comprehensive Analysis and Process System) in China, the climate operational system does not form into an intensive development system. The current systems were developed by different NCC divisions by different period according to the different objective and temporary tasks, and were lack of high level planning and designing, less to say the technique routing and road map over the past twenty years. The ongoing project "Meteorological Disaster Monitoring and Warning project" and the coming project "Climate Change Adaption and Decision Supporting System Project" both funded by China National Development and Reform Commission(NDRC) give NCC a right opportunity to systematically improve the current operational system. NCC founded a new division titled Operational System Development and Maintenance (OSDM) to manage and develop this project this March. According to requirement of the national modern climate operations and services, we redesigned the whole operational system covering from monitoring and diagnosis, prediction, assessment to services operations. The framework was composed mainly of three logical tiers. The lower tier is the climate data center (China Climate Data Center, CCDC) providing rich climate data and productions as well as some related socioeconomic data to upper tiers. The middle tier is the climate operational system (Climate Information Processing and Analysis system, CIPAS) supporting basic and core climate operations. The upper tier is the climate service system (China Climate Service System, CCSS) affording external services operations for government and publics. Meanwhile, the Monitoring & Management System acquires running basic information by real time in order to make systems run stable, reliable as well as maintainable. The framework is shown in figure 1. To implement this logical framework, we also propose a software technical framework including the software architecture, development tools and platforms, and key techniques issues related implementation. Some rapid advances in information technology is used for instance, Geographic information System (GIS) for spatial information supporting, multi-dimension visualization technique for comprehensive rendering, Web2.0 for interactive web page of information sharing, Natural Language Generation (NLG) for text production, Data Warehouse (DW) for massive data management and fully utilization. To speed up the developing, some open sources licensed under the GNU General Public License(GPL) are also introduced, such as: QT development toolkit for implementing cross-platform over Operating System (OS), the Internet Communications Engine (ICE) middleware for inter-processing communication for building distributed applications, and some Quantum GIS components for spatial data handling. The ongoing project was processed for over two years. Some subsystems will be implemented by the end of this year, and some subsystems will bring into operational running. With the end of this paper, some features and functionality of key operational system are described in more detail, and some demonstrations are also shown. Keywords: Operational system framework; Route map; Open source; GIS; NLG, Data Warehouse; Multidimensional visualization;