Phenol-formaldehyde resin is used as the most adhesive to produce waterproof plant-based composite. However, this product contains phenol and formaldehyde which can be easily released to pollute air. Based on the single-factor method, the effect of nano SiO2 on situation of pyrolytic reaction of PF resin was studied by Py-GC/MS. The results were shown that the components of PF by Py-GC-MS analysis were carbon dioxide(83.54%), D,.alpha.-tocopherol (12.55%), 1,3-bis(trimethylsilyl) benzene (1.96%), phenol(1.95%). And the results were shown that t...