Global Soul Limited (GS-SMT LTD), founded in 2011 and located in Shenzhen, China, is a global electronics specialist providing innovative solutions for Surface Mount Technology (SMT). One of the critical components of SMT manufacturing is Automated Optical Inspection (AOI), which plays a vital role in ensuring the quality and reliability of printed circuit board assemblies (PCBAs). This article explores how AOI systems function within SMT lines, their benefits, applications, and the future of quality control in electronics manufacturing, with a focus on the role of AOI in SMT line manufacturers.