To improve the manufacturing efficiency and product consistency of exploding foil initiators, a kind of integrated ex- ploding foil energy conversion unit based on the flexible printing circuit(also called FPC or soft board)manufacturing process was designed and fabricated, and the basic performances of the integrated energy conversion unit, such as electrical explosion performance, driving flyer capability and initiating hexanitrostilbene(HNS-Ⅳ)capability were studied. In the experiment, the voltage curve at two ends of exploding foil was measured by a high-voltage probe. The current curve of discharge circuit was measured by Rogowski coil. The velocity history curve of flyer driven by electrical explosion process was measured by means of Photonic Doppler Velocimetry(PDV). Results show that the peak current of discharge circuit and burst current of bridge foil linearly increase with the increasing of voltage at two ends of capacitor, in which, the burst current increases from 2080 A to 2680 A. The burst time of bridge foil linearly decreases with the increasing of voltage at two ends of capacitor, from 232 ns to 156 ns. With charging voltage increasing, the flyer velocity increases continuously from 4056 m ·s^-1 to 4589 m ·s^-1, and standard deviation value of the velocity is between 38 and 48. The exploding foil energy conversion unit can reliably initiate HNS-Ⅳ explosive when the current peak of discharge circuit is about 2.04 kA, which is lower than that of energy conversion unit fabricated by traditional manufacturing process(2.340 kA).