Abstract: Microbially induced calcite precipitation(MICP)technology can effectively solidify heavy metal-contaminated soils,and the complex external environment can affect the durability of the cured soil. In this paper,by conducting unconfined compressive strength tests and bacterial activity tests,we focused on the effects of freeze-thaw cycling on the strength characteristics and self-healing capacity of MICP-solidified lead-contaminated soil,revealing the relationship between strength,self-healing capacity,and the microscopic mechanism of action. The test results showed that with the increase of freeze-thaw cycles,the height and diameter of the soil increased,but no fissures were produced,and the unconfined compressive strength of the soil gradually decreased and stabilized. After 10 freeze-thaw cycles,Bacillus still had a certain self-healing ability and could continue to solidify the soil,although the activity was low. During the freeze-thaw cycle,Sporosarcina pasteurii can produce calcium carbonate precipitation again through self-healing to make up for part of the strength loss,which results in a smaller unconfined compressive strength loss rate of the soil body.