A large number of welding seams are formed by splicing plates during automobile production and manufacturing,it is difficult to insulate the moisture,dust and smoke from the outside.Therefore,automobile manufacturers will spray automotive PVC sealant process as the top priority of automobile production quality process system.This is also the main reason why many automobile factories introduce visual measurement technology to spray sealant process.The visual measurement technology and its application in robot spraying car sealant system were introduced in detai.