The methods of multiplication and division were adopted to carry out the multi-objective programming and to determine the objective function so as to optimize stand spatial structure for the total mingling, forest layer index, W_V_Hegyi competition index, uniform angle index, and open degree, taking spatial structure and non-spatial structure as constraints. The model of stand thinning spatial structure optimizing model of Cunninghamia lanceolata ecological forest was built based on the determination of stand spatial structure constraint condit...