Based on the typical data collected from the Village of Erlangmiao, Heze Prefecture, Shandong Province, an optimal model for the coupled ecological system of agricnlture, forestry and husbandary is developed by means of the simplex of linear programming. Calculation shows that plantation of economic trees in the tree-netted cultivated fields and extension of wheat-summer soybean on the cropland can greatly increase the economic benefit and improve the soil. In order to make full use of forage grass resources, it is better to raise cows, sheep, rabbits and swine in animal husbandary. Products can be used at a multiple level repeatedly by cultivating mushrooms or other shade-enduring plants among trees and planting mulberry trees for silkworm raising, an operation that contributes to the stability and balance of the coupled ecological system and brings more economic, ecological and social benefits.