After 1998’s disastrous flood in Yangtze River, Songhua River and Pearl River, NFFS has been designed, developed, tested and implemented by BOH of MWR associated with related universities and scientific research academies. Based on the existing status of hydrological information and forecasting in China, NFFS has been developed in Client/Server structures, relying on the uniform real time hydrological information database and GIS platform.It adopts the standardized and advanced software and hardware environment with modular and opening structure to easily add new models and procedures. It possesses the common forecasting models and method library to promptly build forecasting schemes. It has the functions of model parameters calibration that combines manual error-trial and automatic optimization methods.