To investigate mechanism in TUDOG(Transeverse Uniform Droplet Oxygen Generator),a one-dimensional chemical reactive flow model is established to describe physical and chemical performance as mixed Cl₂/He gases passing through BHP(KOH,H₂O₂,H₂O)droplet field transeversely.Gas-phase flowfield is approximately considered as 1-D homogeneous flow according to incompressibility hypothesis.Chemical reaction in liquid droplet is described by reactive-diffusion equations with 4 gasous components.Concentration of gasous components are described with convective-diffusive equations. Droplets are gasous source or sink. It is shown that chlorine utility,singlet oxygen yield and generator efficiency are close to experiment results.The model is verified in simulating interactions between mixing gases and BHP droplets.