Abstract: This paper introduces in quite detail in 8 categories the development of agricultural systems engineering technology in developed countries. These categories are: plant growth, pest forecast and management, agricultural production technology, crop drying, hydrology and pollution, agricultural economical planning irrigation and energy and resource management. The paper also gives a simple brief of the ⅡASA Research Institute in Vienna. The paper next summarizes briefly the development of agricultural system engineering technology in China for the past 5 years, enumerating important research items such as: the study of agricultural production structure patterns, rice culture standardized techniques, unified planning of modernized agricultural scientific experiments, county or regional economical planning, pest forecast, rational disposition of agricultural machinery, state farm planning, etc. It also reports newly started studies of agricultural softwares. Finally, in accordance with the present situations of China the author gives constructive suggestions regarding the policy of development of agricultural system engineering in China, the establishment of basic softwares and data banks and the training of specialized personnel.