<p>High nonlinearities and expensive computational costs in analysis have led to a lack of effective solutions for impact-resistant design using topology optimization. Equivalent Static Loads Method (ESLM) transforms dynamic loads to static loads based on displacement, effectively avoiding the above-mentioned issues. It is an effective method for some simple impact problems (i.e., the deformation trends barely change with the structural configuration). However, when dealing with complex impact problems, it is challenging to obtain a satisfactory design due to the significant difference between static loads and impact loads. A novel Impact Loads Simplification Method (ILSM) is proposed to improve the impact resistance by enhancing the stiffness of the structures, and a topology optimization framework is established. This method transforms dynamic loads to static loads based on actual impact forces. The variation of impact forces in both time domain and spatial domain is fully considered. Two representative examples including an impacted beam (a simple impact problem) and a wing subjected to bird strike (a complex impact problem) are used to validate the effectiveness of ILSM. The results show that designs with higher stiffness, measured by the maximum displacement during the impact, can be obtained compared to ESLM, especially in complex impact scenarios.</p>