Abstract: Abstract：This paper based on the panel data of China’s provinces from 2007 to 2016, the evaluation index system of urban-rural integration level was reconstructed, and the level of urban-rural integration in China was measured by entropy method. Then through the trend surface analysis, spatial autocorrelation and threshold model to study the spatio-temporal characteristics of urban-rural integration and its threshold effect in China. The results show that: the level of urban-rural integration in China has steadily increased and in the five dimensions of “urban-rural space, urban-rural economy, urban-rural society, urban-rural culture, urban-rural ecology”, and the regional differences have shown an “N type” change with the trend of “two rises and one decline”. There is an unbalance between regions with a relatively stable spatial trend of “East high and low west” in the east-west direction, and a spatial trend of “lower intermediate heights at both ends” in the north-south direction. The level of urban-rural integration shows the characteristics of spatial agglomeration on the whole. The locally urban-rural integration level hot spots and sub-hot spots are mainly concentrated in the eastern part and the southeast coast provinces of China, the cold spots area is mainly concentrated in the central and western regions. The urban-rural income gap and government behavior all have a significant double threshold effect on the level of urban-rural integration.