Fourier analysis method is often used to measure the modulated transfer function MTF results quickly.And for this reason,the software for testing the optical transfer funcyion of CCD camera is developed based on the knife-edge scan method,With this software,digital image files obtained by CCD camera can be read in,the noise among the data can be filtered and the position of the knife-edge can be auto-identified then the suitable area can be chosen to calculate the optical transfer function of the CCD camera.This software,which has a favorable user's interface,is developed with Visual C++and can be operated conveniently.The calculated results can be outputted as both list and format.Our testing results are consistent with those gotten from Russian software.