Abstract: Leonardo da Vinci, known as painter, sculptor, astronomer, inventor, musician, mathematician,anatomist, physiologist, geologist, botanist, writer, military engineer, architect and cartographer, is a representative figure of the Italian Renaissance humanism. This paper describes another aspect of Da Vinci：his research results of fluid mechanics and the contributions related with turbulence, flight, wave and storm, and it is concluded that he is the pioneer and founder of fluid mechanics science as well.