Based on the investigation and analysis of component of acid water from sewage-storage dam at a mine in Yongping,Jiangxi province,the chemical of acid sewage was studied.A technical thought to improve the anti-erosion property of cement concrete was put forward.The study provides a theoretic basis for the further development of acid-resisting and anti-seeping materials for acid sewage storage dam of mine,and the design,construction,reinforcement and evaluation of sewage-storage dam.