Abstract: To quickly and effectively acquire and analyze field information，a Palm-sized Personal Computer(PPC) based field information fast collection and real-time processing system was designed. Compared with desktop computer, the operation system of this system is neticeably different n many aspects of system development and design, which is brought by windows CE OS. So the difference which was generated by the key technologies of the system, due to different hardware environments, was analyzed and debated. These key technologies include geographic information system (GIS), spatial access methods, database technology on windows CE, sampling control plan, etc. Based on the particularity of farms, an object-oriented farm model was developed to describe farm objects properly, to edit sampling plan conveniently and to conduct sampling control easily. As a kind of real-time system, the system can be used with global positioning system (GPS) and kinds of sensors to acquire and analyze field information instantly. The precision test of two GPS systems(AG132 and MAP330) was finished by the system. The result of experiment validated higher accuracy and stability of AG132 and more suitable to be used in precision farming. The experiment process and result also indicated good practicality of the system. The research and development of the system provided key technology for the development of equipment for precision farming field information fast collection and real-time processing.