Salt migration and enrichment caused by the capillary migration of the salt solutions have been the important cause of mural deterioration. The soluble salt redistribution which influenced by the capillary migration of salt solutions in mural plaster under different humidities is studied. At the same time

the increase in height of capillary with time

water content and electrical conductivity distribution with height

specimen surface before and after capillary saturation under different environmental humidities

either the content of the soluble solution distributions with height after capillary migration are analyzed. The test results show that

the lower the air relative humidity is

the more water migration to air during the capillary rise is; it is difficult for water to move upward at the same time. The water content of samples with height decreases

but the electrical conductivity of samples with height increases. The crystallization of soluble salt in rising capillary water occurred. NaCl crystallization is enriched in capillary striker

Na2SO4 crystallization is enriched mainly in the second striker. The results of this study can provide a scientific basis for preventing and controlling salt damage of the mural.