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The temporal and spatial change of crop planting structure reflects the change of regional agricultural supply and demand patterns, and is an important basis for the government to formulate regional agricultural development strategy in the future.【Objective】The study aims to explore the temporal and spatial changes of crop planting structures in Guangdong-Hong Kong -Macao Greater Bay Area (GBA) in the past 30 years, and provide a basis for the reasonable adjustment of crop planting structure and agricultural layout next step.【Method】With the regional and county-level crop planting data, the temporal and spatial characteristics of the planting structures in the GBA from 1990 to 2020 were analyzed from the types of planting structure and the change trend of planting proportion by using the methods of time series change trend and spatial agglomeration analysis.【Result】From 1990 to 2020, 82.35% of counties and cities in the GBA adjusted the planting structures. The proportions of grain, oil plants, sugarcane and other important agricultural products decreased gradually, while those of the high-income crops such as vegetables and fruits increased significantly, and the richness of the main planting types of crops increased. In terms of planting structure type, with 2010 as the boundary, the GBA has changed from a rice-dominated type to a vegetable-dominated type accounting for half, supplemented by a rice-vegetable-fruit combination type, showing a balanced layout of rice-dominated type, fruit-dominated type and vegetable-fruit combination type. In terms of spatial pattern, different planting structure types have different spatial aggregation patterns, among which vegetable and rice planting show spatial aggregation characteristics in Guangzhou and Foshan areas with relatively higher urbanization development level.【Conclusion】In the past 30 years, the planting structure of the GBA has changed from food production to diversified planting, and further concentrated on cash crops such as vegetables and fruits. Under the background of increasing resource and environmental constraints, keeping the red line of cultivated land improving comprehensive agricultural service level, and further meetin the demand of urban residents for high-quality agricultural products are the key points to the adjustment of planting structures in the GBA next step. [ABSTRACT FROM AUTHOR]