Abstract: The effects of the air velocity,the air temperature,the injector pressure drop and the flameholder position on the f uel distribution in the flameholder plan e were investigated.It was found that the penetration and the diffusion of the fuel vapor were differed greatly from the fuel droplets.The geometry of the flamehold er has strong influence on the air flow field,and therefore,on the two phase fuel distribution.There a re two different trajectories in a hot a ir stream.A semi empirical method has been developed to predict two phase fuel distribution in the flameholder plane,based on the trojectory diffusion model considering above factors.