Abstract: Agricultural engineering discipline is important material basis and necessary measure for agricultural modernization.In the new historical conditions，how to develop modern agriculture is an urgent problem faced by science and technology workers to study and to solve.According to author′s many years of long-term research and practice，China′s historic agricultural achievements and important role of agricultural engineering were summed up.At the same time，implication of agricultural engineering was defined，and some aspects of agricultural engineering should be improved.