Abstract: The gas phase oxidative cracking (GOC) of decane and hexane has been investigated in this paper. The higher performance of reaction and decoking were obtained in the GOC processes, as compared with their pyrolysis processes. At lower temperature, GOC process of decane is more suitable for producing liquid compounds, as well as low alkenes. A lower alkene yield of 13.1% and liquid yield of 37.4% were obtained in GOC of decane under the condition of 500℃ and n(C)/n(O)=2.5. For GOC of longchained alkane, O2 participates primarily in the oxydehydrogenation reactions at low temperature while it takes part in the oxidation reactions to produce COx (x=1,2) at high temperature,. Under the same reaction conditions, a higher ring opening activity was obtained in GOC of decane compared with that in GOC of hexane.