Abstract: Sun Chengze’s Shui Li Shu (Water Conservancy), collected in the Cheng Yu Tung East Asian Library, University of Toronto, is the only extant copy that we know at the moment. However, according to An Annotated Bibliography of Chinese Rare Books in the Cheng Yu Tung East Asian Library, University of Toronto, the book is considered a pseudograph. It is misunderstood as Jiu Zhou Shan Shui Kao, another book by Sun Chengze. A survey reveals that Sun Chengze’s descendants transcribed Shui Li Shu, collected in the Cheng Yu Tung East Asian Library, University of Toronto. Obviously, it is not the same book as Jiu Zhou Shan Shui Kao. Shui Li Shu is an important book written by Sun Chengze on water conservancy, and is a book of high academic value.