Based on field survey and lab analysis,we emphasized the dissolution in the process of stalagmite depositing. According to mechanism of dissolution, dissolution can be sorted into three types: physical dissolution, chemical dissolution and biological dissolution. With the study of field observations and stalagmite longitudinal profiles from South China, it shows that dissolution is ubiquitous phenomena which runs through the speleothem forming process. In the field, physical dissolution and chemical dissolution lead to errosion pits on the top of stalagmites. Biological dissolution forms crusts of weathering that wrap around stalagmites. In the longitudinal profiles, physics—chemistry dissolution forms discontinued sedimentary lamina, calcium carbonate filling formation and tiny voids. Biological dissolution shapes weathering crust laminae.