Polylactic acid, biodegradable polymer from biomass, is poor at thermal characteristics and mechanical properties due to low crystallinity and crystallization rate. Therefore, many researches are reported to improve it`s poor properties. In this study, we introduced some nucleating agents to enhance that weak points of PLA and investigated it`s features by DSC, polarization microscope and UTM. We used talc and β-cyclodextrin as nucleating agent to confirm thermal characteristics and mechanical properties. Thorough this study, we proved that talc work as nucleating agent on PLA and are shown that mechanical properties are improved.