Brilliant projects nurture brilliant spirits. The South-to-North Water Diversion Project is the largest-scale drinking water diversion project whose construction lasted the longest time in human history. The project is a great produce of national scientific overall planning and coordination，the spirit of people living in reservoir area who migrated from their homeland to support the national planning，the spirit of dedications and sacrifices of leaders who organized the migrate affairs，the innovation spirit of engineers and construction workers. The spirits which the South-to-North Water Diversion Project contain embody the meanings of four levels which include national overall planning，people’s supremacy，innovation and the pursuit of the best works，devotion and shouldering the responsibility voluntarily. The four levels are closely connected and integrated with each other. They collectively form the complete spiritual system of South-to-North Water Diversion and echo with the Project. The spirits of South-to-North Water Diversion will last forever and produce profound influence on human society.