Variable stiffness (VS) composite laminates allows tailoring the material stiffness continuously, thus the overall structural performance, such as buckling loads, can be significantly improved. The buckling behaviors of the VS laminates are mainly focused on the static case, while for the dynamic load case, its buckling behaviors are not well understood yet. In this paper, we focused on the dynamic buckling behaviors of the VS cylindrical shell under impulsive axial pressure and torsional loads. Especially, we use the geometrically exact and high order continuous isogeometric method (IGA) to study the dynamic buckling problems of the shell. To assess the influences of geometric imperfection on the dynamic buckling of VS composite cylindrical shell, eigenmode based geometric imperfections are considered which can be naturally incorporated into the framework of isogeometric analysis by using NURBS surface fitting method. Besides, failure criterion is considered to better capture its dynamic buckling behaviors under extremely short load durations. REFERENCES [1] Y. Guo, Z. Hu, H. Zhu, H. Yan, Z. Hong, X. Wei. Dynamic buckling analysis of variable stiffness composite cylindrical shells based on isogeometric analysis. Thin-Walled Structures, Vol. 217, pp. 113749, 2025. [2] Y. Guo, M. Pan, X. Wei, F. Luo, F. Sun, M. Ruess. Implicit dynamic buckling analysis of thin-shell isogeometric structures considering geometric imperfections. International Journal for Numerical Methods in Engineering, Vol. 124, pp. 1055-1088, 2023. [3] Y. Guo, Z. Chen, X. Wei, Z. Hong. Isogeometric dynamic buckling analysis of trimmed and multipatch thin-shell structures. AIAA Journal, Vol. 61, pp. 5620-5634, 2023.