The arbuscular mycorrhiza fungi (AMF) was researched as an object in karst soil of different vegetation restoration stages (tree

bush and herb) of three typical karst sites (Huajiang

Zhijin and Huaxi)

which were located in Guizhou Province

China. Some indexes such as species abundance

spore density

relative isolation frequency，important value，species evenness index and sample Shannon-Wiener diversity index were calculated after morphological identification

in order to explore the composition features and AMF species diversity in vegetation restoring process. The results showed as follows: The experimental soil totally contained 68 species of 10 genera

8 families and 4 orders

and Glomus is the biggest genus by 35 species

and the second was Acaulospora (17 species)

when Gigspora

Paraglomus and Archaeospora only have 1 species respectively in this study. Specially

Glomus lamellosum had biggest species abundance

relative isolation frequency and important value in all AMF species

which it was as an dominant species in three sampling sites. At the AMF species level

the abundance presented Tree＞Bush＞Herb in Huajiang

Bush＞Herb＞Tree in Zhijing

Bush＞Tree＞Herb in Huaxi. The evenness index and Shannon-wiener index of AMF species in different stages presented Tree＞Bush＞Herb in Huajiang and Zhijing sites

however the Shannon-wiener index in Huaxi site significantly higher than Tree and shrub stages. We suggested that the differences of heterogeneous conditions may affect on composition and diversity of AMF species.