Characteristics of soil organic carbon for different sizes of soil aggregates within 0-10,10-20and20-40cm layers were studied under different planting patterns of Tamrindusin the dry-hot valley of the Jinsha River.Results showed that the content of soil organic carbon was the highest for 1～0.5and 0.5～0.25mm aggregates,but the lowest for 10～5mm aggregates.There were significant variations in different planting patterns of Tamrindus artificial forest.The content of soil organic carbon was the highest in Tamrindus+local herbs and Tamrindus+Paspalum natatu artificial forest and however,the former was greater thanthe latter.The content of soil organic carbon was the lowest in Tamrindus+Phyllanthi emblice artificial forest.The content of soil organic carbon in the three layers had small change in bare land.