Abstract: Based on an all-terrain vehicle, a kind of field three-dimensional topgraphic measuring system was developed, including All-terrian Vehicle, RTK-GPS, Lightbar guidance devices, a field computer and data record software. In the system, high precision RTK-GPS and the embedded field computer were used for measurement and record of three dimensional topgraphic data, respectively, and the Lightbar device was developed for area-covering guidance during field data collection to improve efficiency and quality of data collection, then the system was evaluated through field tests. The results showed topgraphic data collected by the field topgraphic mapping system and manual data collection method could maintain good dimensional consistency with the maximal average error of 3.54 cm and the maximal standard deviation of 2.48 cm. The system can meet the need of field topgrapic measuring for agricultural field leveling.