To measure the thickness of glass by using a displacement sensor on line is an effective method.In the production process of glass,the thickness of glass is directly related to the product quality.Therefore,in this paper,an on-line glass thickness measurement apparatus is presented and a glass thickness measurement system which uses a CCD laser displacement sensor as its signal receiver and can display measurement result in real time is proposed.After the measured data are collected and stored with an A/D card and read out by a computer,the glass thickness can be obtained.