Abstract: A further karstlogical research including morphology, hydrogeology, hydrology and pulse test is done in an experimental area the Houzhai underground river basin, Puding county, Guizhou Province. Eight types of spatial structures are obtained by cluster analysis. These are Fenglin basin, Fenglin clay platform, revived, Fenglin doline depression, oldfenglin doling depression, Fenglin (or fengcony) valley and Fenglin depression. They have their own surface and underground structral features, so their characteristics of morphology, hydrogeology, hydrological process, hydrochemistry and pulse waves are different. By analysing these characteristics on the basis of observations it can be seen that different hydrology process curves and the respons curves of puls test may reflect distinct underground structral features. Further, it is believed that the Karst landform evolution in the basin is mainly a positive evolutionary process from Fenglin doline to Fenglin basin accoding to the study on the spatial structure. But reverse evolutionary process from fenglin basin to Fenglin doline has been formed in the western region.

Key words: karst landform, karst underground water, evolution of karst landfrom, karst hydrology, Guizhou