Analysis on Correlation Effect of Cultivated Land Utilization Intensity and Comprehensive Grain Production Capacity in Guangxi—An Empirical Study Based on Improved Grey Relational Model

【Objective】The study was to explore the correlation effect between cultivated land utilization intensity （CLUI）and comprehensive grain production capacity（CGPC）in Guangxi, and provide a reference for the implementation of the responsibility system for food security in Guangxi.【Method】The output, scale and comprehensive comparative advantage index were used to calculate the CGPC of Guangxi. Based on the evaluation index data of CLUI in Guangxi from 2010 to 2017, the improved grey relational model was used to analyze the correlation effect between CLUI and CGPC.【Result】 There was a significant correlation effect between CLUI and CGPC in Guangxi, but there were some differences due to different kinds of crops . The CGPC of rice was characterized by triangular arrowheads correlation pattern of “material intensity + planting intensity + technology intensity”, while the CGPC of corn was characterized by single correlation pattern of “planting intensity”, CGPC of soybean was characterized by double correlation pattern of “planting intensity + material intensity”, CGPC of potato was characterized by single correlation pattern of “labor intensity”.【Conclusion】Based on the correlation effect between CLUI and CGPC in Guangxi, it is suggested to improve the mechanism of cultivated land regulation and balance of land use and compensation to ensure the effective use and supply of cultivated land, to adjust the planting structure of crops and optimize the distribution of regional grain production, to strengthen agricultural technology research and development and promotion and make full use of intercropping pattern, to optimize the mechanism of allocation of rural labor for realizing land conservation and grain production and income increase through multiple channels.