Abstract: The information process system and assessment system of environmental effect for precision rice plantation and the artificial intelligence system for measure of grain yield installed in combine harvester are designed and completed．Now the systems and the technique of precision agriculture have been used in demonstration site in the Experiment Basis of Shanghai Precision Agriculture．Based on the idea of spatial-oriented，object-oriented，user-oriented，the Farming Geography Information System for precision paddy plant is developed，which is characterized by network，intelligence and visualization．The Decision-making Management System is integrated by rice growth model and expert model for rice culture．The DGPS，RS，GIS，sensors and computer technique are adopted in building the artificial intelligence system for measure of grain yield installed in combine harvester，so the combine harvester can provide the grain yield and its distribution for site．