Polylactic acid(PLA) is widely used in 3D printing. Against the mechanical properties defects of low strength and poor toughness,a fabrication method of PLA/TiO_2 composites was researched. First,the nano-TiO_2 was prepared via a hydrothermal method with tetrachloride titanium as the sources of Ti. Then the PLA/nano-TiO_2 composites were prepared by melt-mixing extruder with the prepared nano-TiO_2 and PLA. The result shows that the nano-TiO_2 composites with two different morphologies are obtained by chang...