Abstract: 1,3-2,4-Di(3,4-dimethylbenzylidene) xylitol (DMDBX) was synthesized by using xylitol and (3,4-dimethyl) benzaldehyde as raw materials. The resulting product was characterized by element analysis, Fouriertransform infrared spectroscopy, 1H-NMR, 13C-NMR and differential scanning calorimetry. The haze of PP decreased to 17.6 % with the addition of DMDBX as a nucleation agent, while the haze of pure PP reached 36.3 %. However, its impact strength and tensile strength were improved to 5.083 MPa and 36.90 MPa compared with 4.527 MPa and 34.90 MPa of pure PP, respectively. Moreover, its Vicat softening point decreased from 158.6 ℃ to 157.0 ℃, respectively. It is evident that DMDBX can improve the optical property of PP significantly, slightly enhance mechanical properties, but has little on thermal stability.