Abstract: This study carried out slaking tests of two different weathering of basalt residual soil,and analyzed the slaking curve of the undisturbed soil,dried one hour and weathered 48 hours.As a result,it was found that the slaking velocity of the dark red sample was the fastest.Because of the different water contents,the slaking time for the undisturbed sample,the dried one hour sample and the weathered 48 hours sample lasted the longest,the second and the shortest of all,respectively.Slaking destroyed forms were different under different conditions and were influenced by content change.The fractures induced by wetting/drying cycle was the one of the most important facts in slaking of basalt residual soil.The results are useful for the design of protecting and strengthening measures for the basalt residual soil.