Abstract: In 2016, China cancelled the Temporary Purchase and Storage Policy (TPSP) of corn and put forward the principle of 'Price Supplement Separation'. The influencing factors of corn yield under the background of TPSP adjustment have become the hot issues in theoretical research and practical activities on agricultural economy field. Based on the sample data of corn yield and total power of agricultural machinery, sowing area, agricultural fertilizer application amount, effective irrigation area and policy factors (implementing TPSP or not) in Hebei Province from 1991 to 2017, the least square method was used for regression analysis to establish the optimal regression model between corn yield and the above influencing factors in Hebei Province. The results showed that there was a positive correlation between sowing area, effective irrigation area and corn yield, and these two factors had the most significant impact on corn yield. The total power of agricultural machinery and policy factors also had a great influence on corn yield. The amount of fertilizer application had a minor impact on corn yield in Hebei Province. Based on the above results, we put forward some policy suggestions such as enhancing the construction of farmland infrastructure and strengthening the policy support on corn industry.

Key words: Temporary Purchase and Storage Policy, corn yield, influencing factors, regression analysis