Social policy is an important means for governments to realize their function. Quantitative evaluation on the effect of policy implementation can help the governments make decisions scientifically and reasonably. Based on non-experimental data，this paper summarizes the evaluation methods for all kinds of the “counterfactual” policy effects deliberately constructed in current micro-policy field， such as instrumental variable method， regression discontinuity method，difference-in-difference method and matching method， elaborates the advantages， disadvantages and applicable conditions of each method， and makes brief review of the selection of each model in the practice of policy evaluation.