In order to improve the dynamic and precise control of crop irrigation and nitrogen application,the study designed the intelligent irrigation and nitrogen application management system for crop including hardware and software.The system utilized the site polling technology,message queue technology and PID(proportion integral differentiat)control technology to develop crop intelligent irrigation and nitrogen application integrated machine products for crop.On the basis of hardware products,based on automatic control technology of water-saving irrigation,irrigation forecast technology and irrigation and nitrogen application decision model technology,the intelligent irrigation and nitrogen application management software system for crops compatibled with intelligent irrigation and nitrogen application integrated machine products was developed,which realized timed and quantitative precise irrigation and nitrogen,real-time warning and intelligent decision making for crops.The system has been applied in winter wheat,summer maize and summer peanut,according to crop irrigation system and nitrogen application program,and the irrigation and nitrogen amount fertilizer needed for crop growth were irrigated intelligently.The system is simple in operation,stable in operation,and achieves the purpose of efficient utilization of irrigation and nitrogen.