The basic principle of spectrum method in color measuring and its specialty are analyzed , and it is used in judging the ending of acid - alkali titration . the whole structure and the light source driver circuit are designed in detail ; the single chip control system ' s hardware interface and software design are given 分析了光谱法颜色测量的基本原理及特点,并将它应用于酸碱滴定的终点判断,具体设计了颜色测量系统的整体结构与光源驱动电路。