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A design method of image acquisition system was presented, which can acquire edge character information at higher speed. The design method combined the C8051f060 microcomputer as control core and circular hardware circuit to drive linear CCD image sensor. Simple pretreatment circuit was used to transform two parallel CCD output signals into an avaliable video signal, which was changed into digital image datas by A/D conversion module from C8051f060 microcomputer. The digital image datas were sent into computer by serial port communication. Hardware circuit of the system which can avoid some deficiencies of previous methods has the following advantages: simple design principle, high level of integration and low cost. The result of experiment shows that the image acquisition system not only generates drive signals to meet the CCD work requirements but also has a better anti-inteference and stbility to acquire the signal of edge character and achieve high-precision measurement by a high-speed and efficient way.