A new kind of through bulkhead explosive initiator for oil well usage was designed in order to achieve stronger initiating ability in the air. Its initiating ability in the air was studied. The maximum air gap,through which the through bulkhead explosive initiator can initiate a secondary high explosive booster for oil well usage,is 85mm while the ones of a booster for oil well usage and a traditional through bulkhead explosive initiator initiating boosters for oil are 65 mm and 20 mm respectively. So the former is much stronger than the latter in the initiating ability in the air.