To toughen poly(L-lactide)(PLLA),PLLA/PTMC 100/0,95/5,90/10,85/15,80/20(w/w)blends were prepared by solution coprecipitation.And PLLA/PTMC 90/10 blends with 1%,3%and 5%(mass fraction)poly(L-lactide-co-trimethylene carbonate)(PLT)as compatibilizer were also prepared by solution coprecipitation.The thermal,morphological,and mechanical of the compos-ite samples were studied in detail.The results indicated that the addition of PLT can increase the com-patibility of PLLA and PTMC,whose toughness was much improved compared with that of the neat PLLA.