The factors to affect the ignition property of airbag ignition system were studied from three aspects of ignition composition.The ignition results show that types of ignition composition in the gas generator have apparent influence on ignition property;At the same time,along with the increasing of ignition composition dosage,change trends of ignition property of different types of ignition compositions are not same;The ignition time becomes long when the burning area of ignition pellets decreases,for example increasing diameter or height of the pellets.