Based on the LES method，the buffeting noise characteristics of automobile side window was studied with the DSLM subgrid-scale model． The simulation method was verified through the comparison of experimental data，and the buffeting noise characteristics of different opening degrees of side windows，different combinations of opening modes，crosswinds and the number of passengers were also studied． The research results show that: the SPL and frequency of buffeting noise increases with increase of the vehicle speed; the side window has lower buffe-ting noise at a small opening degree and higher buffeting noise at a large opening degree; the buffeting noise under the positive yaw angle is lower than the negative yaw angle; the number of passengers has a limited impact on the buffeting noise．