Abstract: Arch Dam frequently use of the Hydropower Project, and it is strictly requests to the rockmasses quality. The fault zones extensive distribute contact face rockmasses,have its thickness and is impossible to dig out completely. Based on the study of comprehensive deformation modulus on contact face rockmasses quality fault zones compression area of Hydropower Project,associative the massive sound waves data and on-site actual measured data, we can take a quantitative evaluation to the excavated rockmasses quality of contact face,and this study can be a evidence to treating local bad rockmasses of excavated contact face,and will do some help for other similar project.