Based upon thecalculated solution ratesbyusing thewater cbemacal data in the Hongshuihe River Basin,the influences of precipiton,lithology,geomorphology and temperature on solutional intensity have been analysed.The resuIts show that lithology is the most important factor aftecting on karst solutional intensity;precipitation is the second. The solutional intensities will slightly increase with surface relief, but the influence of temperature on solutional intensity is not obvious in the area. Finally,an equation to estimte solutional intensity is given as follows:In(x)=1/(4.21/In(P)+0.829/In(lf)+0.295/In(G)-0.636) where P is the annual precipitation,lf is the lithologic mark value,G is the geomorphic mark value, X is the solutional intensity.