Biodegradable geosynthetics as a biodegradable geosynthetics was introduced in terms of biodegradability. Development of biodegradable geosynthetics, its background and technical concerns were discussed through some research results of PLA (polylactic acid) specimens. Test method for biodegradability of PLA as a biodegradable geosynthetics were considered and suggested based on composting method. Finally, the rest result shows that the concept of biodegradability for biodegradable geosynthetics is available in the environmental application. PLA 4032D/PBAT (80/20) blend shows improvement of environmental performance as a biodegradable geosynthetics application than PLA 4032D only used.