The feasibility of one foil with bi-directional exploding foil initiation technique was carried out. A novel bi-directional exploding foil initiation structure was designed by using the characteristics of bi-directional driving flyer in the sequence of electrical explosion. The performance to initiating HNS-IV was studied as well. Results show that the synchronous precision of bi-directional initiation has reached the level of nanoseconds with reliable firing energy of 1.2 J as a basis. Test range is between 40-68 ns..