Opportunity cost measurement is an effective approach to reasonably and scientifically reflect the fair price of agricultural products.Based on the analysis on maize price and its fluctuation,this paper takes soybean as a reference to calculate the maize income opportunity cost and the technology advancement opportunity cost.The results show that the land opportunity cost of maize is 1.46 yuan per kg,profit opportunity cost is 1.24 yuan per kg,and technological progress opportunity cost is 1.11 yuan per kg.Therefore,in order to encourage the enthusiasm of farmers’ cultivation,ensure food safety and avoid loss of maize production resources,the reasonable maize should be priced from 1.11 yuan per kg to 1.46 yuan per kg.This paper finally put forwad some policy suggestions for the governments to adopt maize protection price and make directions for the industrial development of maize.