Abstract: Thirty samples of tropical limestone forests in Guangxi were classified into six formations using Two-Way Indicator Species Analysis (TWINSPAN) and these six formations constitute two vegetation types of higher class. The classification results are: Ⅰ. Valley seasonal rain forest:( 1 ) Form. Saraca chinensis + Sterculia nobilis ( 2 ) Form. Horsfieldia hainanensis +Dracontomelon duperreanum. Ⅱ.Limestone hill seasonal forest: (1)Form. Deutzianthus tonkinensis + Acrocarpus fraxinifolius var. guangxiensis( 2 )Form. Cleistanthus petolottii + Vitex annamensis ( 3 ) Form. Cephalomappa sinensis ( 4 ) Form. Cephalomappa sinensis + Burretiodendron hsienmu. The samples were also ordinated using DCA (Detrend Correspondence Analysis) . The first axis of ordination reflected water gradient from wet valley to dry hill. The second axis was shade gradient.