The mollusc, arthropod and chordate visible to naked eye in Boduo cave and Jialiang cave, Libo county, Guizhou, PR China were observed and collected several times on February and July of 2002-2005. 1045 samples collected in Boduo cave belong to 3 phyla, 6 classes, 13 orders, 27 families, 45 species or groups, including a new species (Chamalycaeus libonensis sp.nov.). 469 samples collected in Jialiang cave are subordinated to 3 phyla, 6 classes, 9 orders, 24 families, 52 species or groups. According to the animal species and their numbers in the light area of the two caves, 6 animal communities were classified. According to the analysis of community diversity, community D(8.3223), D(3.4677), D(3.8286), D(0.9057), C(0.0404), and D-E(0.6611) have the highest species richness index, diversity, maximum diversity, evenness, dominance and similarity index, respectively. The results of correlation analysis between environmental factors and community diversity showed that the content of organic matter in soil has the much significant correlation (r=0.908, 0.913, 0.826, and 0.818 respectively) with species, species richness index, community diversity and maximum diversity index of community and has the significant correlation (r=0.674) with the evenness index of community. The content of CO2 in air has the negative correlation with species, the species richness index, and the diversity, maximum diversity and evenness index of community and their correlation coefficients are -0324, -0.552, -0.573, -0.345, and -0.742, respectively. The above results indicated that the content of organic matter in soil and the content of CO2 in air are the important factors that influence the community change of cave animals.