Abstract: Dazu Stone Carvings is one of important stone relics existent in China, which has significant historical and cultural values to this world, one of which had been once listed as "first protect engineering" of stone relics in China. Recently, a new round protecting engineering, including reinforcement of dangerous rock masses and seepage treatment of rock masses, is started by department of cultural relics protection. In order to determine situation of fracture zones developed in the rock masses of Dafowan in Mount Baodingshan, one spot of Dazu Stone Carvings, a detecting work based on cross-hole elastic wave CT technique is carried out on the position designated. The velocity imaging of rock mass between holes resulted from the detecting work clearly reveals the scales and space attitudes of fracture zones in the rock mass between holes. The reliability of the imaging result is demonstrated by the compatibility of the fracture zones with the tectonic stress field of regional geological structures, and the detecting result provides a reliable reference for the analysis of seepage and stability of Dafowan rock masses.