A thermodynamic analysis of the homogeneous and heterogeneous equilibrium system of hydrocarbons indicated that，the maximum acetylene yield was 98.6% in homogeneous system and 53.1% in heterogeneous system while H/C was 4.Some factors which affected methane conversion efficiency，acetylene selectivity，acetylene yield and specific energy of requirement（SER）were investigated，and the relationship among the concentration of acetylene，yield and SER was analyzed.The methane conversion efficiency，acetylene selectivity and yield decreased and the concentration of acetylene etc.product gas increased with the increase of methane feeding rate，SER did reach a minimum point and then increased.With 4.0 m 3·h-1 methane feeding rate，minimum SER，concentration of acetylene and yield did reach 9.68 kW·h·kg-1，11.4% and 86.2% respectively.The increased maximum extent of acetylene yield approached 18% and 55% respectively by quenching and change of residence time.