Modern theories on regional development hold that moderate differences in regional economic development facilitate the efficient allocation of resources and the shift of industries between regions, but the oversized differences will weaken the existing division of labor and economic cooperation, or even do harm to the regional economic and social stability. Taking the counties (including counties, county-level cities and municipal districts) of Liaoning as the study object and the GDP per capita as the measuring indicator, this paper analyzes the spatial-temporal pattern of economic differences in Liaoning Province from 2000 to 2009 by way of EDSA. The findings are that, the inter-county economy is highly auto-related, and the inter-county economic differences are enlarged first and dwindled afterward. In terms of local differences, the counties of "H-H" type are currently found mainly in Shenyang and Dalian, with a trend of extending to other coastal areas; the counties of "L-L" type are mainly in west Liaoning, including Fuxin, Chaoyang, and Huludao. The spatial distribution of counties with economic hotspots seems to be random and indefinite, with Shenyang and Dalian dominating them. Based on further analysis of the driving mechanism of the inter-county economic differences from the perspectives of historical development, locational conditions, policy implications and adjacency effect, the paper points out that, Shenyang and Dalian have firmly been established as the core of Liaoning coastal economic zone, and Shenyang economic zone since "Liaoning coastal economic zone" and "new industrialization and comprehensive reform pilot area of Shenyang economic zone" have been developed into "national strategies", but their radiation function and leading role are still limited.
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