It is very important to study the coupling coordination relationship between ecological civilization construction and socio-economic development for evaluating the construction effectiveness of ecological civilization construction demonstration area. Taking Anji County, the earliest county which was rated as ecological civilization construction city in China, as a case study, this paper studies the coupling coordination process and evolution trend between the ecological civilization construction and socio-economic development by constructing an evaluation model and indicator system. The results show that:① on the whole, the construction of ecological civilization level and socio-economic development level in Anji County have the same evolution law of continuous and steady improvement, showing a trend of synchronous improvement since 2006 when Anji County was rated as an ecological civilization demonstration area.② from 2006 to 2021, the coupling trend between ecological civilization construction and socio-economic development has the characteristics of the "high overall level-stable growth" in Anji County. The coupling relationship between ecological civilization construction and socio-economic development were closed and the coupling level improved from high coupling in low position to high coupling in high position. ③ from 2006 to 2021, the coordination trend between ecological civilization construction and socio-economic development in Anji County has the characteristics of the " maladjustment-barely coordination-moderate coordination-good coordination". The coupling relationship between ecological civilization construction and socio-economic development steadily evolved from low level to high level. It reflects that Anji County has constantly promoted the mutual support of socio-economic development and ecological civilization construction, and has created a high-quality green coordinated development road of ecological economy and economic ecology. The results can not only provide useful support for the sustainable development of Anji County in future, but also provide a new method for evaluating the effectiveness of ecological civilization construction demonstration area.