Abstract: Aiming at problems of low utilization efficiency of agricultural water and environmental deterioration caused by excessive application of chemical fertilizer in China，a set of automatic intelligent control system of micro irrigation water and fertilizer integrated operation was researched and developed which was suitable for corn planting in northeast China.Function and working principle of three modules of field information collection，fertilization decision-making and intelligent fertilization control were introduced.Practical application results showed that this system reduced fertilizer application by 10%～12% and increased fertilizer utilization by 5%～6%.It was of great significance to improve utilization rate of water and fertilizer resources.