According to the stipulation of GJB 4225-2001, the tested grenade is required to be safely dropped during loading and unloading (simulated altitude 3 m) or during shipment (simulated height 12 m). In order to assess whether the test grenade fall is safe, a device is needed to simulate the grenade any posture in free fall test requirements. A set of test device for grenade dropping experiment is designed from the flexible gripping device. Tensile spring preloading system was used for the experimental device to realize the guarantee of reliability and safety during gripping process. The laser sensor was used to complete the measurement of the key data of the drop height. Through ADAMAS and MATLAB combined simulation and field test, it is proved that the system can meet the drop of grenade at any posture and get stable and reliable test data.