The full English name of "A SUB FIELD Ecological Chain" and the abbreviation "ASF" aim to efficiently reverse the idle land in the world based on the circulation of rural idle land, so as to maximize the value of idle land. It is an open, transparent, efficient collaboration, and risk-controllable new intelligent green economic ecosystem constructed by combining advanced technologies such as blockchain, Internet of Things, Internet, and artificial intelligence. In terms of resource allocation and utilization, it is online, standardized, and structured, so as to complete the digital reconstruction and upgrading of various industries and empower the healthy development of the industry.