Abstract: Based on related literature and the actual situation of Urumqi,the regional coordination index system of population-economy-environment coupling in Urumqi was constructed,and the trend of the population-economy-ecology coupled coordination degree in Urumqi in recent 10 years and the main influence factors were analyzed by using the coupled coordination degree model and obstacle degree model. The results showed that,the coupling of population-economy-environmental system in Urumqi from 2005 to 2015 had a trend of continuous improvement,and the coupling degree was mild disorder and recession,moderate disorder and decline,mild disorder and recession,near coupled coordination,and barely coupled coordination respectively,and the coupled coordination indicated 3 types,from the initial economic lag type to the ecological environment lag type,population lag type. The main factors influencing the coordinated development of Urumqi population-economy-environment system were：excellent rate of environmental air quality,industrial wastewater discharge,centralized treatment rate of urban sewage,proportion of tertiary industry,total retail sales of social consumer goods and total import and export volume.

Key words: population, economics, environment, coupling degree, coupled coordination degree, obstacle degree, Urumqi city