Abstract： Objective To study the stability of night vision goggles (NVG) mounted helmet for pilot under G loads,so as to provide reference for the design and use of the NVG helmet.Methods Six subjects wore properly suited NVG mounted helmet and mask.The adjustment ensured them with clear and entire field of view (FOV).The target design and method of measuring the FOV of NVG were settled for test.Static load test was conducted first.The vertical displacement of helmet was measured when the load applied on and off the top of helmet.The migration of the FOV of NVG was recorded.Then the man-rated centrifuge test was conducted with selected + Gz profiles.The displacement of helmet and the migration of the FOV of NVG were also recorded.Results Corresponding to the statically applied equivalent G loads of +3.0 Gz/15 s,+4.0 Gz/15 s,+5.0 Gz/10 s,+5.5 Gz/10 s and + 6.0 Gz/10 s,the mean values of displacement of helmet were (7.52 ±5.44) mm,(7.79±4.89) mm,(8.78±5.99) mm,(9.17±5.85) mm and (12.07±9.79) mm.Corresponding to the same loads on human centrifuge tests,the mean values of displacement of helmet were (8.72±3.77) mm,(16.28±5.12) mm,(16.56±4.12) mm,(27.50±9.63) mm and (44.22±15.80) mm.The displacement of helmet and the migration of the FOV of NVG were increased with the load increase.The displacement of helmet and the migration of the FOV of NVG tested in human centrifuge were bigger than those in static test.Conclusions The study establishes the indicators and methods of evaluating the stability of NVG helmet and provides the reference for design and use of NVG helmet.