Water conservancy construction project post-evaluation sustainability is to point to in water conservancy construction project built after period of time, through the external conditions and the analysis of the internal conditions, and using the evaluation index system, and scientific evaluation method and modern evaluation method to evaluate the development of water conservancy construction project scale, coordination degree, continuous degrees, the water conservancy construction project for the sustainability of diagnosis, and the development trend prediction, and find out the influence of the water conservancy construction items sustainable risk factors, and then puts forward improvement measures. Project sustainability evaluation should be generally include financial analysis and environmental impact analysis, technology condition analysis, management and analysis of mechanism, policy analysis, etc. Project persistent factors generally fall into the inner sustainable development factors and external fact