Abstract: The dynamic behavior of the airdropped flexible container under impact loading was predicted based on the properties prediction of composite material. A unit cell finite element model of the textile composite was constructed, and mechanical properties of the composite were obtained by applying periodic boundary conditions on the unit cell model. Based on the prediction, the impact numerical test of the flexible liquid storage container, which contains 80% water in volume, was carried out. The interaction between the container and the fluid was modeled and studied using the multi-material ALE method. Numerical results were compared with experimental data for the validation of the model and the approaches, which shows that the periodic boundary conditions can provide more accurate results. In addition, the impact model and the fluid-structure interaction (FSI) technology are also validated.