Currently a large number of remote sensing device use a Charge Coupled Device (CCD) sensor as its photographic equipment, and the ground resolution is one of most important performance parameters of the CCD sensor. For all types of CCD sensor, the tradition method to obtain the ground resolution is implemented through human eyes’ observation. Based on the imaging performance of the ground radial targets in the CCD sensors and combined with optical principle, a new method of automatically detecting the dynamic ground resolution of the CCD sensors was proposed. This new method has considered various factors which influence ground resolution. Besides, it has overcome the shortcoming of the traditional method. The experiment results validate the reliability and stability of this automatic detection method with different remote sensing images.