When the fault current is successfully interrupted by the CB open, it always contains a subsidence current in the secondary side of the current transformer (CT), and this current extends the reset time of the breaker failure current, which may lead to breaker failure protection’s maloperation. Now, it used to increase the delay time of breaker failure protection to avoid maloperation. In this way, when the CB is real failure, breaker failure protection will take much more time to open the CB, and this does not meet the fast feature of protection relay. In this paper, based on difference characteristic between subsidence current and other current, it presents a method to identify subsidence current fast. In this method, it effectively avoids breaker failure protection’s maloperation by the recognition of subsidence current without increase the time delay. In the last, the RTDS is used to test the breaker failure protection integrated with the subsidence current blocking function. The result shows that the improved breaker failure protection takes good operation behavior in both fault current condition and subsidence current condition. No maloperation on the subsidence current condition, no non-action on the fault current condition.