Abstract：The lowboiling fraction(LBF) of biooil contains about 85% water, which is difficult to remove completely. Nevertheless, abandoning it is not only a waste but also a pollutant to our environment. Then, aqueousphase reforming (APR) is a promising way to categorise it as resource rather than waste. Using Pt/Al2O3 as catalyst, 757 mL gas product was gained and at the same time the selectivity of H2 reached 65.86%. Considering the high price of Pt, it was necessary to study the stability of Pt/Al2O3 during this reaction. The used catalyst was characterized by Xray diffraction(XRD), transmission electron microscopy(TEM), scan electron microscope(SEM) and temperature programmed oxidation(TPO). It demonstrated that after reaction the properties of catalyst changed a lot. After calcining in air, the recycle use of catalyst was tested. However, the catalytic activity and selectivity of H2 dropped down substantially for subsequent APR runs. That is to say, the stability of Pt/Al2O3 is poor during APR of LBF.