<p>Acid fracturing technology is the main reservoir modification method of cavity carbonate rock in Tahe oilfield. However, the conditions of cavity carbonate reservoir are complicated, the mechanism of fracture and cave interaction is not clear, and the effect of acid fracturing on stimulation is not obvious. Therefore, in this paper, the interaction between acid fractures and caves under different distribution angles of different acid systems is discussed through the physical simulation experiment of true triaxial acid fracturing. The results show that: (1) The initial propagation stage of the fracture is mainly controlled by the horizontal stress difference. When the acid fracture spreads to the far well area, the acid fracture is attracted by the cave. (2) The distribution angle of acid fracture increases with the increase of the distribution angle of cave. (3) When the acid concentration increases, the acid fracture is easy to continue to propagation directly through the cave. Compared with self-generated acid and solid acid, gelling acid is easier to pass directly through the cave and has a larger propagation area when the injection conditions are fixed.</p>