The　real-time　information　monitoring,　acquisition　and　analyze　of　arc　in　welding　process,　is　a　key　way　to　ensure　welding　quality,　and　to　enhance　the　level　of　arc　welding　technology.　With　the　rapid　development　of　measuring　technique　and　measuring　methods,　the　method　to　obtain　valuable　information,　after　classifying　complicated　arc　information,　has　made　great　progress.　This　article　starts　from　the　physical　properties　of　arc,　summarizing　the　situation　of　arc　working　process　monitoring　and　measurement　at　home　and　abroad.　The　arc　monitoring　and　measurement　mainly　includes　probe　method　and　schlieren　method,　representative　of　active　measurement,　also　the　arc　electrical　signal,　sound　signal　and　light　signal　acquisition,　representative　of　passive　measurement.　This　article　after　recommending　the　theory,　characteristics　and　research　status　of　each　welding　arc　measurement　technology,　the　forecast　of　the　development　trend　and　prospects　of　this　field　are　given　in　the　end.　©　2018　Journal　of　Mechanical　Engineering.