Abstract: As a key technology to promote transformation of traditional agriculture to modernized agriculture, internet of things（IoT） integrates advanced technologies such as sensors, wireless communication and cloud computing, which is of great significance to improve agricultural production efficiency and crops quality．Basic concept of IoT, system structure, present situation of application in domestic and foreign countries, and key technologies and examples of agricultural application were summarized．Combined with actual situation of agricultural production in China, problems encountered in promotion of IoT technology were analyzed, and future development trend was predicted and prospected, to provide theoretical basis and practical guidance for promoting widespread popularization of this technology．