Interactive Forecast Preparation System (IFPS) has been one of the highest priority projects of the National Weather Service (NWS) for years. It is also an important component of Advanced Weather Interactive Processing System. The NWS has been developing and testing techniques that support interactive forecast preparation for more than a decade. With interactive operation, IFPS could help forecasters to predict and deliver products effectively. The basic structure of IFPS is introduced and some interactive technical details used in IFPS are discussed. Not only does it show some operational applications of the NWS, but it also gives some useful reference relating to the development of the Chinese New Generation Weather Forecast Process.