It is usually difficult to identify the complicated pyrolysates that include different homologous series.In this study, an integrated method was proposed for identification of the complicated pyrolysates in pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS).In the proposed method, the separated pyrolysates were first searched against standard mass spectra library by probability-based matching (PBM).In the PBM list, only one of the tentative compounds should be selected.However, the selection of the compounds is difficult only by their matching factors.It is often not true that the component with the highest matching factor should be selected.