Abstract: Five kinds of fabrics made of cotton,ramie,bamboo,silk and wool respectively were buried in soil.The mechanical properties and configurations of the fibers from these biodegraded fabrics in soil were measured and analyzed.The results revealed that after being buried for 2 months in soil,there were a lot of holes and flaws on the surface of cotton,ramie and bamboo fiber and,in general their strength at break decreased by over 80%.The scale of wool was denuded but sign of microbial invasion into the inside of the wool fiber and almost no change in its mechanical properties.Whereas on the surface of silk appeared tiny holes and its strength was reduced to 70% of that of the control sample.When being buried for 6 months,cotton,ramie,bamboo and wool was completely degraded.At the same time,the number of holes on the silk fiber surface increased,strength at break decreased by 90%.Silk was degraded into fragments by animalcules,insects etc.in soil after 9 months.