According to bohr atom,eletron will revolve around the stationary orbit untill it remains in that stationary.?

That's why the Bohr model needs to be augmented by quantum physics. Clical physics says that the electron should lose energy. The fact that it apparently doesn't gradually lose energy, but at some point suddenly loses a quantum of energy, as it drops to a lower energy orbit, was one of the first clues that things behave differently at the quantum scale.