Abstract: There are some problems in current assessment system of eco-environmental protection. e.g. the accountability for environmental protection and the top-level design of the Tough Battle against Pollution haven not been considered into the assessment system of eco-environmental protection, the assessment indicators are not synchronized with the improvement of pollution reduction and environmental quality, the results of assessment are only applied into temporary ranking and have not be used to trace the source of the deficiencies found in the assessment. Aiming at these problems, based on the analysis of assessment subjects and objects, contents and indicators, methods and results, and combined with the specialties of Shiyan City, Hubei Province, a third-party assessment model for eco-environment protection was constructed for the city. It was proposed that the assessment objects mainly involve three departments, and the assessment system with 42 indicators was established, including environmental quality, environmental protection policies, planning, project implementation, environmental authorities, supervision and management of pollution sources, and pollutant discharge bodies. The scoring method of environmental quality and management, as well as the specific assessment method and process in eco-environmental protection assessment were put forward. The application results of the assessment model showed that in 2017, the assessment scores of all counties and districts in Shiyan City presented an upward trend in four quarters. The third-party assessment had played a good role in promoting local environmental protection work, improving the level of environmental management, and promoting the stability and improvement of environmental quality.