Recently, for the purposes of increasing the additional value of the machine tool and the development of the intelligence machinery in the industry, the in-process measurement technology is an important tendency. Applying the in-process measurement function into machining process can not only increase the productive efficiency, but also avoid introducing errors caused by replacing the workpiece repeatedly. The online measurement technology is well developed and tends to maturity by many different companies. In addition to control accuracy and reduce human mistakes during machining, the application of in-process measurement technology into intelligence machinery is important. In the article, the online measurement technology is introduced. Moreover, the development of applications of in-process measurement technology at the Intelligent Machinery Technology Center of Industrial Technology Research Institute is presented.