Due to environmental disposal and increasing cost of polyolefin and petroleum-based product, biodegradable polymers have recently been studied. Among various biodegradable polymers, poly(lactic acid) (PLA) has received attention because of its outstanding mechanical properties, but PLA has drawback of its brittleness. To overcome this mechanical drawback, making blend with other polymer has studied as the easiest method. In this study, we blended PLA with poly(å-caprolactone) (PCL), poly(butylene adipate-co-terephthalate) (PBAT) and poly(butylene succinate-co-adipate) (PBSA) to overcome its brittleness. We also added organoclay (Cloisite 30B, Southern Clay Products) to improve miscibility of PLA blends. We investigated this PLA/biodegradable polymer nanocomposites including rheological, mechanical properties and biodegradability.