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Biodegradable Poly (latic acid) (PLA)/Poly(butylene succinate)(PBS) polyblend herein were blended by a melt-blending process to develop a biodegradable thermal plastic elastomer.The phase transitions and compatibility for PLA/PBS polyblend were tested by DMA and DSC.The PLA/PBS blends on the DSC present three transition regions, PBS glass transition region at-31~-37℃, PLA glass transition region at 52~58℃, and PBS melt-crystal region at 108~110℃, which indicating that the PLA/PBS blends occur phase separation resulted from nucleation and growth.