Abstract: Using the directional distance function, and taking the carbon emissions from grain production as the non-desirable outputs, the green technical efficiency of grain production of 17 cities（prefectures） in Hubei Province from 1998 to 2017 was calculated. On this basis, the carbon emissions from grain production and the redundancy rate of input in grain production were analyzed and compared. The results showed that,from the view point of time, the green technical efficiency of grain production in Hubei Province was relatively high, but the total carbon emissions and input redundancy of grain production in Hubei Province fluctuated during the inspection period. From the view point of space, the difference of carbon emissions was obvious among cities（prefectures） in Hubei Province, Xiangyang City was the highest and Shennongjia Forestry District was the lowest. The areas where the input factors generate input redundancy were concentrated in six cities, such as Ezhou City and Huangshi City. In order to promote the green production of grain, it was necessary to establish the mechanism of rewards, punishments and compensations for grain production, strengthen the training of green production knowledge for grain growers, and reinforce the docking of production and marketing of green grain products.

Key words: grain, green production technology efficiency, directional distance function, carbon emissions, Hubei Province