介绍了颜色测量原理，归纳了在线式颜色测量的特点、要求及技术难点，阐述了在线式颜色测量技术发展历程。详细介绍了当前几种国外典型的在线式分光测色仪的主要技术指标、应用范围、系统结构等，指出了每一种仪器的特点和优势。从技术和应用需求两方面对在线式分光测色仪的发展趋势做了展望，为在线式分光测色仪的发展起到一定的借鉴作用。

The principle of color measurement is introduced, and the characteristics requirements and technical difficulties of on-line color measurement are summarized. The development process and the current state of the art of on-line color measurement technology are also presented. The specifications, applications and system structures of several advanced on-line spectrophotometes abroad are presented in detail. The characteristics and advantages of every instrument are highlighted. The development trend of on-line spectrophotometer is discussed from two aspects of technical perspective and application requirements in this paper, which will provide a reference for study on the development of on-line spectrophotometer.