The incineration reaction process of TFT liquid crystal is speculated according to the weight loss character and analysis results of incineration production. It is indicated that the 90% weight is loss from 150 ℃ to 380 ℃ in the incineration process of TFT liquid crystal, which is composed of some monomer compounds. Decomposition reaction first occurs in the process of incineration process. The order of decomposition product lies on the chemical bond energy of monomer compound. The production of radical alkyl and radical aromatic in decomposition process are unstable. Radical alkyl is decompounded hydrocarbon that has much less carbon atom, such as propylene. Decomposition reaction of radical aromatic continues and defluorinate happens with temperature rise. The synthesize reaction occurs between the decomposition production. The production is admixture composed of different aromatic compounds in low temperature. PAHs and HF are observed in high incineration temperature. The mostly incineration production of TFT liquid crystal are venomousness and injurant, so it is not suitable to treat TFT liquid crystal with incineration.