Geometric calibration is a very important step in the research of aerial photogrammetric camera,it includes the measurement of the inner orientation elements and the distortion parameters,they are basic data in aerial photogrammetry and affect the precision of aerial photogrammetry directly.Use collimator to produce parallel light,measure the incident angel of the parallel light and the coordinate of its image on the CCD plane,then calculate the inner orientation elements and the distortion parameters according to the principle of distortion least square.The result can satisfy the requirements of aerial photogrammetric application and prove the validity of the calibration method and the reliability of the measure precision.