Cd-modified labradorite (Cd/Lab) was used as a catalyst for pyrolysis of methane to obtain C2 hydrocarbons. The catalyst was characterized and tested by XRD, XPS, TEM and GC to analyse its structure, morphology and catalytic performance. The effects of metal doping, reaction temperature and feed gas spacevelocity on the catalytic pyrolysis of methane into C2 hydrocarbons were investigated by using a fixed bed reactor. At the feed gas spacevelocity of 1 L/h and the reaction temperature of 1073 K, the conversions of methane catalyzed by natural labradorite and mass fraction of 1% Cd/labradorite catalysts were 3.31% and 6.41%, respectively. Meanwhile, the selectivity of C2 hydrocarbons selectivity was more than 99%. The results that Cd2+ entered into the alkali metal sites in labradorite were demonstrated by XRD, XPS, TEM and catalytic performance of modified labradorite, confirming that the active site of labradorite was alkali metal site.