 This paper proposes a new method for calculating the trajectories of ice crystals in flight. It uses the Lagrangian method to determine the movement of individual particles and then compares the results against experimental data and other reference data. The study found that the smaller the particle density, the lower the collection coefficient. The collection coefficient increases as the size of the ice crystal and the speed of the airflow increase. This article was offered by Zeng Zhihuan, Chuanfulu, Wei Zhong, and others.