MgO/La2O2CO3 catalyst prepared by thermal decomposition of the precursors obtained from coprecipitation method was tested in low-temperature OCM (oxidative coupling of methane). The result showed that such catalyst could hold the reaction for at least 24h at Tex=50 oC (external furnace temperature). The addition of Ni2 to the catalyst caused lower Ti (ignition temperature) and Tm(minimum reaction temperature) of OCM reaction, which was due to the enhancing catalytic performance of Ni2 on COx selectivity in OCM. The addition of Zn2 promoted the C2 selectivity, but brought negative impacts on the reaction exothermicity, which led to the lower stability of the catalyst. The thermal effects of the OCM accompanying side reactions to produce COx played great role on the process of the low temperature OCM reaction. The component La2O2CO3 was believed to provide the main active species for the reaction.