To solve the fracture failure problem of electric connection spring of some aeronautical signal light in the marine environment and its raw material are subject to import, which threatens the security of the national major equipment supply chains. Composition and mechanical properties of material were analyzed by means of SEM, material substitution analysis, the domestic 06Cr19Ni9 was selected as replacement of Japanese piano wire (swp) and British system unembroidered steel wire. Then experiments and tests of system-level key performance such as fatigue life and corrosion resistance to marine salt spray environment were studied after the structural design and production manufacturing with the domestic material. Electric connection spring made of domestic 06Cr19Ni9 through GJB 150.11A-2009 and the ultimate fatigue life is more than 300,000 times. Electric connection spring made of domestic 06Cr19Ni9 exhibits excellent marine salt spray environmental adaptability and high fatigue life, realized the rigid demand of localization. This research can provide scientific and effective verification ideas for China’s aviation equipment to overcome the “stuck neck” problem of core technology and ensure the security of national major equipment supply chain.