The Calculation of moderate population involves the part of the previous studies on carrying capacity, which can be understood as the calculation of the population that can be carried under the conditions of existing water resources and land resources, for example, we should first analyze the ecological sensitivity or the suitability of the construction land, and then obtain the suitable construction area, and calculate the population that can be carried by the per capita construction area, this is a common method of carrying population based on constraints such as land or water. In addition, you can also use some per capita indicators to calculate a moderate population. These indicators include per capita public green area, per capitaGDP, Per capita housing area, per capita living water usage, per capita living electricity usage, per capita Road area, etc., which is an indicator of comfort. In this way, we can calculate the population value that meets the optimal comfort level, which is very different from that calculated through the resource carrying capacity. Therefore, you can also combine the two to perform bidirectional optimization and find the best value.