<p>Experimental tests can provide the most reliable and accurate results for any problem such as blast loading on structures But in some cases it is very costly, risky, and in some cases impossible. Using small-scale models is one of the best alternatives in such cases, but the dynamic response of scaled structures under blast loads often deviates from classical similarity laws, particularly for strain-rate-sensitive materials. To address these discrepancies, it is essential to modify scaling laws, ensuring that they accurately reflect the behavior of structure. In This study Based on classical nonlinear dynamic analysis method, a new formula has been proposed to solve the scaling deviation. By effectively modifying the applied impulse through an explicit formula, the approach significantly enhances the predictive accuracy of prototype model responses derived from scaled experiments. The results validate the importance of considering strain rate sensitivity and highlight the limitations of traditional scaling methods. Accuracy of the formula was verified by numerical simulation and investigated for maximum and permanent plate’s deflection. The new modification method gives better results for maximum deflection rather than permanent deflection. Results showed that the proposed formula can accurately predict the response of the prototype from the results of the scaled model.</p>