Rock cracking is the most serious disease faced by the Huashan rock paintings, causing devastating damage to the paintings. In order to develop effective grouting reinforcement measures based on analysis of the causes and factors influencing rock cracking and field surveys, astatistical analysis was done. The results show that 1) the rock painting area has 418 cracks. The rock cracks are mostly (69%)due to weathering; 2) the thickness of structural cracksis greater than weathering cracks; carbonate, calcium and mud common filling ratio of structural cracking rock is 78%, higher than the weathering cracking rock 52%; 3) the apertures of tectonic fissures and weathering fissures are smaller than 6mm; when the opening is greater than 6mm, the cracking body will be stripped off the block; 4) the I and II levels of the danger due to weathering cracks is 57% and 22%, respectively, less than the 64% and 27% due to structural cracking, but weathering is more developed in the rock art area;the paintings are prone to cracking and falling; 5) because the structural cracks are thick and have good connectivity; they present a very high level of danger.The weathering cracking rocks are thinner, and have low cracking connectivity, so they have lower level of danger.