Abstract: On basis of the principle and mechanism of regional urbanization, the concept model of regional urbanization level was built in the paper, and "AHP-Information entropy-Multiple indexes comprehensive evaluation" model was used to evaluate regional urbanization level based on statistic data of Liaoning Province. The results showed that the urbanization level increased in 2003-2008. The urbanization level of Shenyang City, Dalian City, Panjin City, Anshan City, Fushun City were higher than other cities, and the increase rate of Panjin City is the maximum, and the next is Dalian City. Then the evaluation results were graduated and spatially reveled with GIS, which shows that great differences in the level of urbanization and present Shenyang centered and Dalian centered higher urbanization zone in Liaoning Province. Besides, the reasons of differences of urbanization were analyzed from five criteria layers, including urbanization of population, economic, social, life and environment. The population urbanization level of Panjin City grew rapidly because no-farm population increased with large range, and the economic and life urbanization level of all cities had also increased in varying degrees. But the social and environment urbanization level of some cities decreased from 2003 to 2008 because the number of children in school and per capita green area decreased and some other reasons.