Abstract: By using the sonic wave and the seismic wave, the foundation rock holding layer on-spot testing of TGP has been performed. The results show that the sonic wave speed of spillway foundation rock exceeding 5 km/s(Kv>0.67) occupies 89%, and the one exceeding 4 km/s(Kv>0.53) occupies 89%. The results match with the excellent and good class rock Es ratio of design and adoptive rock quality.?