Abstract: This paper analyzed the charge fingerprint of soil and nutrient status in the karst area of the Jinfo mountain.It was found that under different degrees of karst rocky desertification(KRD),there is a clear change in soil charge fingerprint.Under the condition of no KRD,the range of soil pH keeps nutrient to be consistent with real measured one.Under the condition of week KRD,the capacity of keeping nutrient in layer B is similar to that in layer A under no KRD,and the capacity of layer A was disturbed.Under middle and strong KRD,pH of layers A and B decreases to be acid,which is possibly due to fertilization by land use.The relationship between charge fingerprint and components of soil organic matter was determined to understand eco-environmental problems of a typical karst area.The fulvic acid contains more active function groups compared with humic acid,and therefore has more effect on charge fingerprint.