Abstract: Rocky and desertified land (RDL) is one of the severest environmental problems in eco-rehabilitation of Guangxi. With multi-temporal TM/ ETM data as main information source, the distribution characteristics and evolution rules of RDL in Pingguo County of Guangxi in different periods were studied by field surveys and “3S”techniques. The fol1owing conclusions were obtained: 1) monitoring methods and evaluation model of RDL can objectively reflect the basic situation of RDL in Pingguo County; 2) RDL is mainly distributed in some towns along the Zuoyou river coast and the northeast part of Pingguo County, and from 1988 to 2008 the occurrence degree of RDL worsened firstly and was then alleviated; 3) some advices are given that step-by-step improvement measures should be adopted in the control process. Some suggestions on comprehensive control of RDL are put forward and our proposals and results can be applied to karst regions in southwest China.