The threshold of random laser light is closely related to the scattering intensity in the system. After the high refractive index titanium dioxide (TiO2) nanoparticles and the dye-doped polymer dispersed liquid crystal (DDPDLC) were uniformly mixed, due to the strong scattering effect between the liquid crystal droplets and the TiO2 nanoparticles, DDPPLC's random laser had a lower lasing threshold, which varied with the doping concentration of TiO2 nanoparticles. On the basis of optimizing the doping of TiO2 nanoparticles, the emission threshold of DDPDLC was as low as 270μJ/cm2, and the linewidth was reduced to 0.08nm. Finally, the temperature experiments proved that the scattering of PDLC structure was the main working mechanism for the generation of random lasers. After TiO2 doping, the DDPDLC samples still ensured a good tunability.