Abstract: Based on the analysis of the interaction mechanism between the construction of interconnection project and the ecological environment system of high altitude power grid, the coupling and coordination model is constructed by the theory of system science and the method of entropy value. This model should take into account not only the importance of Engineering construction, but also the sustainable development of ecological environment. In this paper, coupling degree and coupling level are proposed to reflect the coupling and coordination relationship. It is helpful to correctly understand the significance of the construction of high altitude power grid and the dynamic coupling law with the ecological environment system. It provide theoretical guidance for the construction of projects and the sustainable development of the ecological system.