Effects of 8 different deicers or snow-thawing agents on the scaling of concrete were investigated.Results show that regardless of chemical compositions of substances,as long as they have thawing effects on ice or snow,they cause severely deicer-frost scaling of concrete,and therefore,for concrete,no harmless deicer or snow-thawing agent exist until now.Furthermore,compared to the deicer-frost scaling,the chemical attack of these salts on concrete is quite weak.