Abstract: Since Aristotle, many well-known scientists theoreticians have researched the falling movement of dynamics but only Galileo finally made a correct conclusion and inspired a new era for modern dynamics. The article, by interpreting the works by Aristotle, Galileo and others, and by analysis and contrast, looks at the deepening process of human research in falling movement and shows that scientific development not only needs the accumulation of knowledge and innovation but also advanced thoughts and scientific methods.