Unfinished buildings that have recovered their costs have a special starting role in urban agriculture. They can be used to build cement water channels and have a ready-made water supply system. They can produce at least five crops a year. If the development continues, all the current grain and vegetable farmland can be built with 20-story high-rise buildings with more than two or three acres of land on each floor as land for high-rise farmland, so the countryside will become a city. This kind of urban agriculture requires as many high-rise buildings as possible for agriculture due to the current low cost-effectiveness of cereal products but the great strategic significance. All sunlight is supplied by LED lighting and heating provided by MSE, which can be adjusted scientifically. Water utilization must be expanded, but it is completely achievable, including taking water under river ice in winter and using it after being heated by MSE. Rolled paper can be made from the lower part of the crop to serve as artificial soil. For rice, draining the water for a period of time is equivalent to transplanting the rice seedlings. To design and manufacture any agricultural machinery operating within the building. Agriculture will not only be mechanized, but also urbanized. So what is the difference between rural and urban areas? At least grain and vegetable agriculture will rely on MSE to begin industrialization and urbanization.