Abstract: During electric storm unlocking of the sample vessel of a certain spacecraft, the sample vessel jumped the traces suddenly. To understand the impact influence of the vessel jumping the traces in orbit, the phenomenon analysis and the experimental verification of the unlocking impact are carried out. According to the conservation of momentum, the impact distance of the sample vessel jumping the traces in orbit is calculated. And the unlocking shock test is carried out three times to verify the calculations. Both the calculation and test results show that the distance of the sample vessel jumping the traces in orbit is less than 12 mm, thus the sample transferring in orbit can be performed successfully.