Existing studies of rainfall erosion classification focus on the static destructive effects of multiple rainfalls, with the aim of identifying the disease and determining its main causes. In order to study the relationship between rammed earth site erosion and rainfall, and to explore the dynamic developing process of rainfall erosion, we conducted an investigation into the rainfall erosion on the Ming Dynasty rammed wall in Yuyang District. Through classification and statistical analysis, we propose that the basic rainfall erosion models are dry-wet erosion, scouring erosion and collapse erosion. Proposal of the three models provides a new viewpoint for studying the dynamic response relationship between rammed earth site erosion and rainfall.