Ca~(2 ),Mg~(2 ) contents of cave water and their changes are the basic and direct reflecting carriers to the maturity of speleothems.The samples of surface water,bedrock water and cave water were gathered and analysed,such conclusions were drawn:(1) There is no great vibration of Ca~(2 ),Mg~(2 ) contents in cave water,with a 44~52 mg/L content of Ca~(2 ) and 32~45 mg/L of Mg~(2 ).Maybe Ca~(2 ) is the main material resource of speleothems,furong Cave lives in such a development phase that Ca~(2 ) deposit completely and almost without Mg~(2 )deposition.(2) The ratio of Ca~(2 )and Mg~(2 ),to some degree,may be a reflection of the maturity of speleothems,the different permeability in different carbonate area affects on the ratio and degree of depositing.(3)There is no strong relationship between Ca~(2 ),Mg~(2 ) contents of cave water and development of cave landscape.(4)The change of cave landscape for recent 10 years is closed mainly with the change of Ca~(2 ) content and almost no relationship with Mg~(2 ),the ascending of temperature due to energy import has little effect on speleothems,but the change of pH does greatly.