To effectively help the government to invest in public works decision-making, and achieve the project's harmonious and sustainable development, based on the core value theory of public works, authors use Structure entropy weight－Planguage model conducting an evaluation of comprehensive value of public project from social value, economic value, environmental value, scientific, technological value, cultural value and so on, finally authors carry on an empirical analysis based on expert scoring method，which provides a reference method for the evaluation and improvement of the investment decision-making theory and empirical research of China's public works.