Abstract: The phenomenon of the film drops produced by the bubble bursting at a free water surface under the normal temperature and pressure conditions was researched in this paper. While the physical mechanism of this phenomenon was clear, based on the previous ring theory model and the Rayleigh instability analysis theory, a new model of the film drops produced by bursting bubble at the free surface was established under some reasonable assumptions. Using time variables discrete method, mathematical model was solved and the film drop initial parameters were obtained, including the number, diameter, velocity and direction, and initial position. The model calculation results fit well with the previous experimental data, justifying the correctness of the new model.