Abstract:Abstract: Take the Silk Road’s urban agglomerations in northwest China as the research object. This essay establishes index system from 3 dimensions: economy, society and environment. Improved entropy and coupling coordination degree function and comprehensive coordination model are used to evaluate and analyze. We draw the conclusions: ①any two subsystems coupling coordinated development degree of the research object and most of cities of it are relatively high level, and spatial distribution is not balanced that east and west sides are better than intermediate; ②three systems comprehensive coordination degree of the research object is not optimistic, and the transitional type is the main part, which can rise to the coordinated development but also is in danger of falling to declining level;③as for the cities which show different characteristics in comprehensive coordination of three systems, every city should suit measures to local conditions to adjust the development;④The economic and social development index are the key factor for the increase of city comprehensive coordination degree in this area. We should make full use of "the Silk Road Economic Belt and the Sea Silk Road" policy benefit and strategic opportunity to accelerate economic and social progress, to improve the comprehensive coordination degree of three systems, to prevent them from fragmenting, disjointing.