The purpose of this work was to explore the impact of the karst ecological environment on the decomposition of tree litter,and the role of litter decomposition in karst ecosystems in global carbon balance. We utilized field litter bag method to determine the decomposition rate and nutrient release of two species,Loropetalum chinense and Pinus massoniana,both in karst areas and clasolite areas. The results show that ( 1) the litter decomposition rates of Loropetalum chinense and Pinus massoniana in karst areas are generally lower than that in clasolite areas. ( 2) The litter decomposition rate coefficient ( k) has a significant negative correlation with the carbon content of initial leaf litter nutrient( P<0.05) and a extremely significant negative correlation with the lignin content( P <0.01). ( 3) In the decomposition process,the release patterns of different nutrients are various. The nutrient element carbon in the leaf litter shows a continuous decrease during the whole decomposition process. ( 4) The carbon release rate of the two species in karst areas is lower than that in clasolite areas,which extends the carbon cycle to a certain extent and plays a positive role in global climate change.