Abstract: The system of photoelectric passive location with good concealment could improve the combat effectiveness of confrontation in complex electromagnetic environment. The system model of double-station passive location based on CCD was established. In order to improve the accuracy of calculation, the calculation method of target coordinate was provided according to the principle of least square method. The CCD reconnaissance model was established based on atmospheric extinction coefficient, the luminance coefficient of target and background, parameters of CCD imaging equipment. Based on the rule that the detection probability must be more than 10%, the operating distance of single CCD was calculated. Then, the change relations of the double-station location range and the distance of the stations was studied. By the target samples within the effective location range, the double-station location error was calculated. Then, the variation of mean value and standard deviation with the distance of the stations was analyzed. The calculation show that to certain weather and CCD, when the distance of the stations exceed a certain value, the location range would decrease rapidly. With the increase of distance, the location error and its dispersion first increase and then decrease. The analysis results have certain reference significance for optimizing CCD equipment parameters and reasonably configuring the position of observation stations observation stations. The analysis conclusion can be use for reference to optimize the CCD parameters and choose the reasonable location of observation station.