Abstract: The present study took Fujian Province as the research area, and analyzed the grain production and cultivated land use at both province and city levels. The LMDI model was used to decompose the contribution of cultivated land use factors to grain production, and the spatial and temporal analysis of cultivated land use effect was carried out. The results showed that the grain output in Fujian Province was decreased by about 2.4% in 2009-2016, and the grain farming ratio dropped by 8.8%. The decline of grain farming ratio was the main cause of reduction of grain production. From 2009 to 2016, only Longyan and Sanming achieved grain production growth among the cities in Fujian Province. The per capita arable land area of Xiamen's agricultural labor force experienced the largest decline. The grain yield per hectare in Longyan and Zhangzhou increased. Quanzhou's agricultural labor force fell the most. And the grain farming ratio in all cities in Fujian Province declined. Structure effect was the main reason for the reduction of grain production in Fujian, and the factors affecting the change of grain production in different cities were different.

Key words: food security, cultivated land use, Fujian