Aims to the large and unmovable site,taking the measure of scientific and regular maintenance is significant for the long-term preservation of cultural relics.This paper mainly discuss on the deterioration caused by salt and commonly can be found in the wall painting of Mogao Grottoes,through analyzing the kinds and distribution of the salt,the environmental factors which cause the salt moving,and the main factor of environmental temperature changing,suggested to control the rise of temperature of the cave as one of the uppermost regular maintenance measures.
