Aim\ To study the effects when a twisting moment is added to the zig zag device. Methods\ The echo of mechanism to external shock load in case that a twisting moment was added to set back weight has been analyzed theoretically and experimentally. Results\ The dynamic models of complexly forced zig zag device when it moves downward and upward are discussed. Conclusion\ A new idea about complexly forced zig zag device is put forward to improve the performance of delay arming time.