Mozi is a great scientist in ancient China and found the Mohist School, which was the most scientific spirit of the academic group at that time. The book of Mozi not only contains a large amount of scientific knowledge, but also is a landmark in the history of science in ancient China. Based on the theoretical perspective of STS and the primary material of Mozi, through summarizing the basic characteristics of Mohist scientific thought, this essay will reveal its historical significance and modern value.