This paper reports on the analysis of the volume of air and smoke, the waste heat losses and the ratio of fuel saving of the boiler with the technique of oxygen-enriched combustion by a set of gaphics and also on the analysis of the radiant heat transfer and the relationship between the transfer and various heat absorption of working medium in the boilers under various pressures. The conclusion drawn in this paper can be employed to renovate the boilers with oxygen-enriched blast.