In order to improve the fire safety and reliability of an explosive device,a butterfly metal film bridge was prepared by adopting a magnetron sputtering technology with a mask. The bridge surface was smeared by 15-20 mg lead styphnate (LTNR). The current safety testing,antistatic testing and the bridge wire comparative testing were used to study its properties of safety and ignition. Infrared thermal imaging technology was used to verify the heat distribution of the thin film bridge. The results show that the metal film bridge has good antistatic,ignition and mechanical performances. The heat is concentrated in the narrowest part of the center.