[Objective] Study on the coupling of water conservancy construction, ecological construction, rocky desertification which are the trinity planning was carried out in Guizhou Province to promote the project integration between the three aspects, and to achieve the maximum benefit. [Methods] According to the system theory, the trinity as the three subsystem, evaluation index system was established using principal component analysis method, the SPSS software and the coupling degree model were used to calculate. [Results] The coupled system in the coupling of the three planning periods(2006-2010,2011-2015,2016-2020) were 0.68, 0.86, 0.89, respectively, indicating that the coupled system was in the run-in period before the trinity planning, and it had the good resonance coupling after the trinity planning. [Conclusion] The trinity planning can effectively break the bottleneck restriction of the development, and promote social, economic and ecological sustainable development in Guizhou Province. It is proposed to continue to strengthen the construction of the projects with these three aspects.