Electrical　signals,　acoustic　signals　and　high-speed　images　of　welding　contain　important　information　reflecting　the　stability　of　welding　process　and　welding　quality.　The　existing　research　has　not　realize　their　real　synchronization　yet.　In　this　paper,　a　hardware　platform　used　for　arc　welding　process　of　electrical,　acoustic　and　image　signals　synchronization　acquisition　is　designed　and　built.　Through　the　hardware　trigger,　the　accuracy　of　the　synchronization　is　guaranteed.　Based　on　the　LabVIEW　software　platform,　a　synchronous　muti-informational　acquisition　and　analysis　system　about　welding　electric　parameter,　acoustic　signals　and　metal　transfer　images　is　developed　and　realize　the　precise　correspondence　in　time　domain.　Aiming　at　hyperbaric　welding,　a　series　of　test　data　are　acquired　and　statistically　analyzed　and　the　rules　of　hyperbaric　environment＇s　influence　on　welding　current,　voltage,　arc　sound　and　state　of　metal　transfer　are　obtained.　This　research　lays　a　foundation　for　study　on　influence　factors　and　mechanism　of　metal　transfer　in　hyperbaric　welding.　©,　2014,　Shanghai　Jiao　Tong　University.　All　right　reserved.