Basalt residual soil presents strong disintegration phenomenon by climatic influence. In order to understand the relative contribution on hot and humid weather and frequent heavy rainfall in disintegration of basalt residual soil, basalt residual soils were first subjected to wetting-drying cycles, and then were used for disintegration test in atmosphere and in soaking to simulate the effect of the climate change, based on a series of indexes such as disintegration rate, disintegration velocity and disintegrative deposits characteristics. The results showed that hot and humid weather could damage the aggregation between particles and facilitated the dispersibility of soil, and the majority of disintegrative deposits translate from coarse to fine, which in turn may lead to severe disintegration. While sudden heavy rain contributed to more severe disintegration, and with the increment of wetting-drying cycles, disintegrative deposits turn from lump or fragment to powder, and translate to mud, disintegration velocity increases and disintegration tends to a more severe extent. Based on the experimental findings, a disintegration classification for basalt residual soil is suggested in order to determine and evaluate disintegration characteristics according to the laboratory test results.