Based on the Super-efficiency DEA model,the double difference model was used to analyze the net effect of price support policy on soybean TFP in the period of price and the specific impact path. The results show that the implementation of price support policy inhibits the effective improvement of soybean TFP,but there are structural differences and market reforms which help to improve soybean TFP while the suppressive effect of price support policy on soybean TFP is not strong and persistent. The price support policy produces the “negative productivity effect” because it does not bring effective income incentive,and the low level of wealth and market distortion restrain the enthusiasm of soybean farmers to improve the production factor allocation. Considering the fact that the gap with corn yield per unit area cannot be narrowed in the short term,the effect of current soybean producer subsidy policy on improving TFP should not be overestimated if it fails to provide stable income expectation for farmers. Therefore,in the process of adjusting and revising the soybean producer subsidy policy,we should strengthen the strategic design of the system,and shift from the single subsidy incentive to the diversified policy support. 