Experiments on hydrogen/methane/air catalytic combustion were carried out in a micro combustor composed of a quartz glass tube and a ceramic tube. The experiments mainly focused on the effects of mixing ratio, equivalence ratio and inlet flow rate on the stable combustion range, flame feature, wall temperature and the heat loss of tube wall. The experimental results show that the lower limit of stable combustion inlet flow rate decreases when the mixing ratio increases, while it decreases firstly and then increases with the increase of equivalence ratio. In the condition of that the mixing ratio is 0.9 and the equivalence ratio is 1.6, the flame could realize stable combustion as the inlet flow rate varied from 0.25 to 19.00m/s. Simultaneously, the highest wall temperature and maximum length of heat recirculation zone are achieved. Two layers of the flame can be observed in two catalytic zones, the front of the flame becomes inclined cone shaped and its root moves downstream with the increase of mixing ratio. The heat loss of the tube wall increases with the increase of mixing ratio and inlet flow rate, and heat loss rate increases with the increase of mixing ratio and decreases with the increase of inlet flow rate. Radiative heat loss accounting for the proportion of the total heat loss increases firstly and then decreases with the increase of equivalence ratio, and reaches the maximum of 63.93% when equivalence ratio is 1.6.