Abstract: This paper presents a monitoring and controlling system which integrates single chip computer with linear CCD image sensor used for on-line industry. There are fine parts in the hardware setup. They are optical system machinery, linear CCD image sensor and its driving circuit, binarilizing circuit and 8098 user setup. The control software has functions such as displaying and managing keyboard, receiving and storing data, calculating and managing data, correcting deviation and sending out control signal. The measuring range is adjustable because the method of single chip CCD and single end measurement is used. The method of minimum bi-multiplication is applied in the software to correct system deviation. Experiment has proved that the system is practicable.