This paper reports "the fourth set" of drilling tillage after "ploughing (hoeing)" by manpower, animal power and tractor——Fenlong tillage technology (referred to as “Fenlong technology”). It makes the cultivated land and saline alkali land transformed into "sponge" farmland through "drill bit" vertically digging into the soil, one-time deep cultivation, not disturbing soil layer, and granulating the soil, which brings about the effects of "expanding the land, releasing the natural force, water conservation, disaster reduction, carbon reduction, tillage saving, fertilizer saving and grain increasing", and can broaden the space for human survival and development. It has been applied to more than 50 crops in 28 provinces, including Guangxi, Hebei and Tibet. Without increasing the use of fertilizer and water, the yield of varieties in cultivated land increased by 10%-50%, while that in saline and alkaline land increased by 20%-100%. The storage of natural precipitation increased by 100%, and drought, high temperature and low temperature decreased by 20%-30%, and carbon sequestration and emission reduction reached 20%. It is proposed that China can implement the "dual strategy" platform of farmland, saline alkali land, rivers and water bodies constructing the "incremental" "five new warehouses" of grain, water, fish, sugar, etc. and "increased grain return" abroad, to ensure national security.