Urban-rural synergetic development is the destination of rural revitalization,the important support for regional integration and the crux for solving imbalanced and insufficient problems.The paper took the coastal economic zone of Guangdong province as a case.The urban-rural synergetic degree and spatial difference were quantitatively measured by constructing an index system covering economic,ecological,spatial and social parts in 2000,2008 and 2019.The coupling coordination model,grey relational model and the fixed effect model were used to analyze internal connection levels,regional features...