Abstract: Xin’anjiang dam has been in operation for more than 40 years. The article elicited that the coefficient of scour hole was between 0.62 and 1.113, even if larger possible scour depth, the stability ofmain buildings, such as dam, powerhouse and switchyard, can be ensured. Further more, the paper put forward some engineeringmeasures to alleviate flood discharge influence to scour area.