In recent years,the rapid development of non-food cultivation of arable land in China has become an important factor affecting food security. Based on the perspective of national food security,the article constructs a measurement system of non-grain cultivation that takes into account the factors of "cultivation structure" and "output structure",and analyzes the spatial and temporal characteristics of non-food cultivation and the mechanism of spatial differentiation in the mountainous areas of northern Guangdong from 2010 to 2020 by using spatial autocorrelation,gravity center migration model and geographic detector. The study shows that: 1) During 2010-2020,under the influence of the simultaneous increase in the sown area and production of non-food crops,the non-grain rate in the mountainous areas of northern Guangdong increased from 0.521 to 0.587. 2) The distribution of the non-grain rate showed a pattern of "low in the middle and high on both sides",which continued to intensify in the ten years,with Global Moran's I increasing from 0.359 to 0.422. 3) In the past ten years,the clustering characteristics of non-food cultivated land in northern Guangdong have been dominated by low-low aggregation,taking the central region of northern Guangdong as the aggregation center. 4) With the development of non-grain,the main influencing factors of spatial differentiation of non-grain of arable land in mountainous areas of northern Guangdong have been changing,among which the annual light hours,annual average rainfall and per capita arable land area have always been the main influencing factors. 5) The explanation degree after the interaction of each influencing factor of non-grain showed an increasing trend,and the main types were two-factor increase and non-linear increase,in which the interaction enhancement of the main influencing factors was the most obvious. The article enriches the quantitative measurement of non-grain to a certain extent,identifies the spatial characteristics of non-grain of cultivated land in mountainous areas in different periods,the main influencing factors and the types of interactions between the influencing factors,which is of great significance for the measurement and regulation of non-grain of cultivated land in mountainous areas.
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