In order to study the effect of foil bridge included angle on the energy efficiency of exploding foil initiator, five exploding foil bridges of included angle as 30°, 45°, 60°, 75° and 90° were designed and fabricated by an ion etching method. Their electrical exploding performances were investigated. Results show that under the same discharge voltage, the burst current and peak current produced by foil bridge with an included angle of 45° is the largest. The analysis of the relationship between the burst current and the flyer velocity and the comparison of burst power and difference between the burst time and the peak time reveal that the exploding foil bridge with included angle of 45° has a better performance of higher energy efficiency and lower fire energy.