The self-inflating airbags were unfolded and inflated by the self-weight of buffer system at landing. The airbags have some advantages, such as simple structure, convenient usage and higher reliability, and so on. In this paper, the influence of landing velocity and mass on cushioning characteristics for normal opened and bonding self-inflating airbags were studied by indoor experiments. And so did the inflenece of the status of exhaust orifice on cushioning characteristics for bonding self-inflating airbags. The results show that the maximum pressure is directly proportional to landing velocity and mass, the peak acceleration is directly proportional to landing velocity, and inversely proportional to mass. The cushioning performance is better when the vent is bonding.