Regarding of impact on human health due to the excessively low and wet environment in buildings in southern China, indoor moisture purification mortar was adopted to adjusthumidity by using custom indoormoisture purification mortar. Moreover, the performance of the custom mortar was compared with ordinary cement mortarin this paper.Scanning Electron Microscopy(SEM), BET surface area analyzer and BJH method were used to study the interior structure of mortar, and measure the isothermaladsorption/desorption curve and adsorption rate curve by using static adsorption method. Meanwhile, moisture buffering values proposed by NORDTEST project scheme for mortars were tested. Results showed that the WSE(wood fibre, sepiolite, expanded perlite)based composite porous mortar could be used as indoor moisture purification material base; the added admixture could achieve relevant properties without affecting the moisture buffering function of mortar.WSE based mortar has an excellent internal pore structure distribution and is sensitive to moisture. The adsorption ability of composite porous mortar is better than the ordinary cement mortar, and the maximum adsorption capacity of the former is as high as 2 times the latter.The moisture buffering value of composite porous mortar is between 0.5 and 1, and about 3.5 times the ordinary cementy mortar. Therefore, the composite porous mortar can be used as a sort of humidity control material in the purification of indoor wet environment.
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