In this study, organic environmental polymer (PLLA ) and new-type textile polymer (PTT ) were studied. PLLA was the continuous phase and PTT was the dispersed phase. 10~50%(wt%) PTT was added to PLA solution. The crystallization behavior, glass transition temperature, morphology and miscibility of poly(L-lactic acid)/ Poly(Trimethylene Terephthalate) blends were investigated using differential scanning calorimetry(DSC), dynamic mechanical analyzer(DMA), polarized-light microscopy(POM), thermal gravimetric analysis(TGA), and scanning electron microscopy(SEM). DMA results show only one Tg, which could infer that the blends is miscible or partially miscible. The more PTT is added, the lower Tg of these blends are. Under POM, we observe that small amount of PTT (10~20%) can promote the crystallization of PLA. DSC study can be divided into nonisothermal and isothermal-crystallization. From nonisothermal analysis, We find when PTT is 20wt%, crystallization peak of PLA starts to appear. When PTT is 30%, the peak shows maximum. The degree of crystallinity and rate of crystallization first rise and then fall with the increase of PTT. POM shows similar results. The isothermal crystallization behavior could be analyzed using Avrami equation. We find the n value of PTT is about 2.3~2.7 in these blends. Hoffman-Weeks method can predict the equilibrium melting point of each blend. TGA result shows Td will fall down when PTT content increases. Finally, SEM analysis verifies that PLA and PTT is miscible.