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Smart farming for field crops is a significant part of the smart agriculture. It aims at crop production, integrating mod‐ ern sensing technology, new generation mobile communication technology, computer and network technology, Internet of Things(IoT), big data, cloud computing, blockchain and expert wisdom and knowledge. Deeply integrated application of bio‐ technology, engineering technology, information technology and management technology, it realizes accurate perception, quanti‐ tative decision-making, intelligent operation and intelligent service in the process of crop production, to significantly improve land output, resource utilization and labor productivity, comprehensively improves the quality, and promotes efficiency of agri‐ cultural products. In order to promote the sustainable development of the smart farming, through the analysis of the develop‐ ment process of smart agriculture, the overall objectives and key tasks of the development strategy were clarified, the key tech‐ nologies in smart farming were condensed. Analysis and breakthrough of smart farming key technologies were crucial to the in‐ dustrial development strategy. The main problems of the smart farming for field crops include: the lack of in-situ accurate mea‐ surement technology and special agricultural sensors, the large difference between crop model and actual production, the instan‐ taneity, reliability, universality, and stability of the information transmission technologies, and the combination of intelligent ag‐ ricultural equipment with agronomy. Based on the above analysis, five primary technologies and eighteen corresponding second‐ ary technologies of smart farming for field crops were proposed, including: sensing technologies of environmental and biologi‐ cal information in field, agricultural IoT technologies and mobile internet, cloud computing and cloud service technologies in agriculture, big data analysis and decision-making technology in agriculture, and intelligent agricultural machinery and agricul‐ tural robots in fireld production. According to the characteristics of China's cropping region, the corresponding smart farming development strategies were proposed: large-scale smart production development zone in the Northeast region and Inner Mon‐ golia region, smart urban agriculture and water-saving agriculture development zone in the region of Beijing, Tianjin, Hebei and Shandong, large-scale smart farming of cotton and smart dry farming green development comprehensive test zone in the North‐ west arid region, smart farming of rice comprehensive development test zone in the Southeast coast region, and characteristic smart farming development zone in the Southwest mountain region. Finally, the suggestions were given from the perspective of infrastructure, key technology, talent and policy. [ABSTRACT FROM AUTHOR]