Abstract: In order to understand the mechanism of damage of carved rockwall of Baodingshan Grotto by water seepage and weathering,regular sampling and survey are carried out for different types of weathering products selected.This paper deals with the chemical and mineralogical compositions of weathered products from surrounding rock and carved rockwall,chemical characteristics and types of soluble salts in weathering products,and perennial variation of these characteristics in many years.The characteristics of soluble salt formation due to different types of hydrochemical factors are analysed and discussedn, the results can used as a reliable base for protective measures against damage from weathereing and water seepage.