Abstract: Considering its multifunctional, this paper established the comprehensive evaluation index system of agroforestry from three aspects, including ecological function, economic function and social function，and used the osculation value method to evaluate the value of different composite models. Finally, this paper make an empirical study on the comprehensive benefits of agroforestry of Siyang County in Jiangsu Province, using the established evaluation index system and osculating value method to select the superior model, in order to provide theoretical basis and guidance for the development direction of local agroforestry. The results show that: agroforestry models in Siyang County are better than the pure poplar planting model, in terms of ecological function, economic function, social function and comprehensive benefits. Among them, the poplar-dandelion multiple operation model and poplar-mushroom multiple operation model are better than other models in each function. Local farmers can make their own choice according to the actual needs to make full use of forest resources and increase the economic income.