Abstract: County economy is an important part of national economy. Based on the county area as the research scale, real GDP per capita is selected as the research variable, and the difference of county economic development and spatial correlation pattern in Jinsha River Basin from 2009 to 2018 are analyzed by mathematical statistics and spatial analysis. During the research period, the per capita GDP of the Jinsha River basin is increasing year by year, and there are differences at the level of county economic development. The gap between the highest level of development and the lowest is widening and the overall gap is narrowing. The spatial pattern of economic development level is relatively stable, the high value area is mainly located in Kunming City, Panzhihua City and other counties under the jurisdiction, and the low value area is mainly located in Zhaotong City, Ganzi Prefecture and other counties under the jurisdiction. The level of economic development is positively correlated with space, the spatial agglomeration is increasing, and the hot spot area of economic development level is expanding to spots.

Key words: county economy, development difference, spatial association patterns, Jinsha River basin