A robust and efficient algorithm was developed for calculating the droplet collection efficiency and overcoming the non-universal defect in the Lagrangian method. A point-locating scheme based on a non-plane intersection determination algorithm was used to achieve the fast localization of droplets in polyhedron mesh. Using mesh adaptive refine techniques and curve projection algorithm

the difficulty of calculating collection efficiency on complex configuration was avoided. This step effectively reduced the complexity of the algorithm. The analysis results discretely distributing in the spatial configuration was interpolated to the model surface by radial basis function. Some cases valuated the improved algorithm. The testing report showed that the deviation of the calculating results using the proposed method from the experimental data was not more than 15% and the necessary trajectories for calculation significantly decreased compared with the traditional model. It shows that the this method has high engineering practice value and popularization sense.