Abstract: Mesoporous ZrO2/Ti-MCM-41 materials were synthesized under hydrothermal conditions，and characterized with XRD，FT-IR，UV-Vis and nitrogen adsorption-desorption. The results showed that the obtained materials were mesoporous molecular sieves with long-range order. The crystallinity of ZrO2/Ti-MCM-41 became poor with the increase of ZrO2. ZrO2/Ti-MCM-41 was used as catalyst in the pyrolysis of PP. The influences of reaction conditions，such as n(Si)∶n(Ti)，content of ZrO2，temperature，dosage of catalyst and reaction time on the pyrolysis results were examined. Under the optimum conditions of n(Si)∶n(Ti)=40，mass percentage of ZrO2 18%，temperature 400℃，m(catalyst)∶m(PP)=0.02 and reaction time 0.5 h，the conversion was 91.2% and the yield of liquid products was 83.6%. Compared with the results obtained by thermal pyrolysis and catalytic pyrolysis on HZSM-5，ZrO2/Ti-MCM-41 was of better catalytic activity and higher yield of liquid products，and was especially suitable for the pyrolysis of sterically hindered polymers，such as PP.