Coordinated development between the ecological environment and socioeconomy is of great importance for local sustainable development. The present study investigated the coupling between socioeconomy and ecological environments using the coupling coordination degree model, scissors difference, and coupling degree model based on the economic and ecological data from Ansai County, Northern Shaanxi Province. A comprehensive assessment index of the socioeconomic environment was also established by the entropy method. Results showed that the comprehensive assessment index of socioeconomic systems increased from 1996 to 2013, and that of ecosystem decreased with fluctuation. This result indicates that eco-environmental development lagged behind the socioeconomic development. The degree of coupling coordination increased from 0.33 to 0.59, reflecting an improvement in the relationship between the socioeconomy and the ecological environment in the region, and a favorable coordination between them. The scissors difference fluctuated within the range of 0.032, indicating an increased difference in the development of socioeconomy and ecology. Coupling between the socioeconomic and ecological development in Ansai ranged from 45° to 90° and the beta-coupling rose initially and declined thereafter this result suggests a contradiction between the economy and environment. Our results indicate that efforts should be made to strengthen the promoting effect of ecological construction, alleviate the contradiction between the social economy and ecological environment, and realize the coordinated development of the socioeconomic system and ecological systems.