Abstract: High reaction performance and decoking ability were obtained in gasphase oxidative cracking (GOC) of decalin, as compared with its pyrolysis reaction. In the GOC process, high liquid yield could be achieved at a low temperature; while at high temperature, the yield of lower alkenes can overpass the yield of liquid, in which the aromatics, especially BTX (benzene, toluene and xylenes), dominated the overall liquid compositions. The optimal reaction conditions for GOC of decalin are: temperature 700℃~800℃, residence time<0.4s, molar ratio of decalin to oxygen 0.3~0.5, where pure oxygen can be replaced by air for GOC process. Under the conditions of 800℃, nC10)/n(O2)=0.5 and a residence time of 0.4s, the yields of lower alkenes, BTX, and total liquid products reache 37%, 29%, and 50%, respectively.