As a basic unit of the national economy, the county economy includes allsectors of the three industries, involving production, circulation, consumption anddistribution, and is a relatively comprehensive economic system. Starting from theconnotation of county economic development level, the county economic development level evaluation index system of economic strength level, industrial structure level, investment consumption level and living standard of residents is established. The entropy method was used to quantitatively measure the development level of county economy in nine key counties of Jilin Province from 2013 to 2017, and to sort out theincreasing trend of fiscal deficit, the lack of development kinetic energy, the narrow gap between urban and rural areas, and the loss of human resources. It also affects and restricts the common problems and causes of the county-level economic development level of the key ecological functional areas in Jilin Province, and further proposes the main path of revitalizing the county-level economic development of Jixian County in the key ecological function areas of Jiin Province:(1) Develop a green economy, highlighting County differentiation.(2) Cultivate the characteristic economy and create the growth pole of the service industry. (3) Optimize and adjust the industrial
structure to achieve industrial integration and development.