Abstract: It has carried on the compared experiments for 12 Stylosanthes guianensis in degraded Mountain Yuanmou of the dry-hot Valley from 2007 to 2009. Their growth period,the biomass above the ground, leaf/stem ratio, dry/fresh ratio, the number of divarication,stub height etc.were recorded. The results showed that: 1)The best combination property of forage was S.guianensis CIAT11362, it was highest for average yield, dry yield and survival rate of three years of S.guianensis CIAT11362, whose average dry yield was 20.31 t/ha, dry seasons dry yield was 7.17 t/ha, survival rate of three years was 87.5%, it is a more drought-resistant grass, adapted to arid and semi-arid region. 2) GC1579 S.guianensis and S. guianensis reyancv No.5 are optimum integrated traits can be used as dry and hot valley to promote grass. 3) the 90089 and the West S. guianensis overall performance, though not particularly outstanding, but have the advantages which in special environment should not be ignored, they maybe ideal under the different performance requirements.