Water leakage has been the primary problem for the protection of Dazu Rock Carvings (DRC) along with its whole lifetime, but the effect of leakage treatment was far inferior to the demand of protection in the past few decades. Based on conventional hydrogeological theories, this study has carried out by focusing on the Grottoes Cliff Hydrogeology and the special hydrogeological conditions of the unloading cliffs in the Dafowan have been clarified basically. The research shows: Both the sandstone and mudstone of the Dafowan cliff can be regarded as relatively impermeable materials in seepage flow. The bedding planes and tectonic fractures affected by unloading forces constitute the main seepage flow channels within the DRC cliff zone. Some fractures with ten centimeters aperture may form by horizontal landsides along the strata except unloading force. The strata formation of Baodingshan is nearly horizontal, but the EW and SN trending wide-flat folds by tectonic movements of Sichuan and North China periods are very important for the seepage of unloading and unsaturated cliff zones. Water sample analysis from the research area reveals: A complex flow system with long-range and short-range seepage are coexisting within the same space. Geological rock-water interaction and human effects combine along the flow path in the particular cultural cliff rockmass. The flow and material inside water indirectly control derived diseases such as dissolution and salt precipitation. Based on the water level distribution analysis, the hill behind the carving cliff affected by unloading force can be divided into three zones. The non-unloading effect zone is greater than 2 times height of the cliff. The unloading influence zone is 1-2 times the height, and the strong unloading zone is within 1 time the height range. The non-unloading effect zone is dominated by pore saturated flow in the loose soil layer and weathered fractured layer, while the strong unloading zone is dominated by unsaturated and multi-layered fissure flows. The role of opening fractures with high penetration ability must be contemplated dialectically, the leakage water diseases can be aggregated inside these fractures and the seepage flow will be alleviated around these fractures at the same time. The main underground stream flow systems, with complicated mutual crossing flow and leakage recharge inside different flow, have been analyzed. Through this study, a theoretical basis is provided for the systematic and minimal intervention of water seepage treatment in Dafowan, and an example is provided for constructing micro hydrogeological condition models under the special terrain, landform, and environment of cliffs with cultural grottoes and carvings.