Abstract: An experimental investigation of secondary atomization of liquid fuel at the lip of the flameholder has been completed by means of Malvern Particle Sizer.This secondary atomization has several features:Fine droplets occur in the high speed air flow side,while gross droplets occur in the recirculation zone side;the velocity of air flow(V a)has a predominant influence on the mean drop size(MMD)of the spray,the effect may be expressed quantitatively as MMD∝V -1 75 a.The mechanism of the secondary atomization may be described as follows:Some of the liquid drops in the spray are gathered by the flameholder and form a fuel film in its surface,the air flow forces the wavy film to move forward to the lip of the flameholder,further the fuel film breaks up at flameholder lip under a pincer attack of high speed turbulent flow and low speed recirculation flow.