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Field survey is a very important step in the process of land consolidation and rehabilitation. Traditional methods of field survey take much time and effort and it is difficult to locate facilities of projects, to measure area or length and to spot and record problems quickly and accurately. A global positioning system (GPS)-based field survey system is introduced. Firstly, the framework of the system is described. Secondly, the key technologies are shown. including data preparation, locating accurately, coordinate transformation, field measuring and field editing. Finally, further applications are discussed. The major result of this study is a GPS-based field survey system which will promote the application of GPS-personal digital assistant (PDA) technology in the field of land consolidation and rehabilitation, creating an effective method for improving field survey. In this paper, the authors analyse the demands of field survey and introduce the basic ideas of system design and the major functions of the system. This paper also focuses on the implementation of key technologies which are expressed by unified modelling language (UML) figures and tables, such as data preparation, field positioning, coordinate registration, field measurement and recording. It has been shown that the GPS-based field survey system can greatly enhance the quality and efficiency of field survey, help solve many technical problems and make field survey more straightforward. Widespread adoption of GPS-PDA technology is important to improving land and resource management. [ABSTRACT FROM AUTHOR]