A quantitative investigation on particles scavenged by liquid droplets is crucial in understanding the removal of atmospheric aerosols and pollutants by means of natural and artificial precipitation. The deformed shapes of falling droplets and potential flow fields were numerically obtained to further solve the equation of motion of small inertial particles and simulate the impact with droplets. The calculated particle collection efficiency slightly increased with decreasing surface tension coefficient due to the change in shape of the droplet. However, the increase in volumetric diameter resulted in lower collection efficiency despite the deformation because of larger Stokes drag acting on the particle. Numerical results were collected to suggest a new model for estimating the collisions between particles and droplets, and evaluating the effect of droplet deformation on the collection efficiency.