During low temperature oxidative coupling of methane reaction, the content of BaCO3 has an important influence on the catalytic performance. The CH4 conversion and C-2 selectivity improved with the increase of the BaCO3 content. Under ignition conditions, the 7.5% BaCO3/ZrO2 catalyst had the best catalytic activity in which the 35.4% CH4 conversion and 29.5% C-2 selectivity could be obtained at 250 A degrees C. The temperature profiles of reactor have been described and found that the distribution of hot spots on catalyst bed is related to the low temperature activity of catalyst.