The principle is to divide the farmland into 4 sections, the first section, digging swimming pools of water in 30% of the catchment area, all because of agricultural water is required, the second part, the rice planting. 30% of the amount of space, because the family wants to eat the main food source is required for the. The third part, planting perennial fruit trees keep the interest income supplement sales, eating part of it, and the fourth section is used to create a space for buildings such as housing. Animal housing 10% of the total area of Changsha. The number portion of this area, all can be increased or decreased depending on the suitability of a particular area, and.