In this paper, the spatial-temporal characteristics of non-grain cultivated land in Sichuan province from 2000 to 2019 were analyzed by using quantitative model, and the influence of non-grain cultivated land on economic growth was discussed by using Theil index decomposition method. The results showed that: In terms of temporal characteristics, both the non-grain area and the non-grain rate of cultivated land in Sichuan province showed a fluctuating increase in time series, which increased first, then decreased before 2010 and then increased after 2010, and there was a negative correlation between the nongrain conversion of cultivated land and the proportion of cultivated area of food crops in the five economic zones. In terms of spatial characteristics, the non-grain area of 21 cities and prefectures was less in northwest and more in southeast, but the non-grain rate was higher in northwest and lower in southeast, and the spatial difference of the five economic zones was obvious, and the changes of the non-grain area and the non-grain rate of cultivated land were not synchronous. The non-grain area of cultivated land in Sichuan province and its five economic zones was correlated with GDP, and the non-grain conversion of cultivated land had non-absoluteness to regional GDP growth; Although the overall difference of the impact of non-grain cultivation on economic growth had decreased, the regional and spatial difference was significant, and the regional contribution difference was the source of the overall difference of the whole province, which was affected by the regional difference of economic development. And the countermeasures and suggestions of strengthening the control of the use of cultivated land, strengthening the coordinated management of departments, perfecting the compensation system of cultivated land, and strengthening the publicity of cultivated land protection were put forward.
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