Probe measurement has always been an advanced measurement method,which is widely recognized by the manufacturing industry.Its advantage lies in its ability to provide a variety of process and quality solutions at relatively low cost in complex production environments,greatly improving processing capacity and production efficiency.This arti-cle summarizes the application results of infrared touch probes in a domestic engine cylinder block machining production line(hereinafter referred to as the cylinder block production line)for several years in the process of new project modifica-tion and series production.By introducing its multi-dimensional application scenarios,abnormal fault alarm analysis,and a probe optimization case integrated with the key technology of cylinder bore coating,the importance of the probe in the production practice of cylinder block is comprehensively elaborated,providing reference for the industry.