Abstract: Meteorological astronautical system is a meteorological systemwhich consists of one or several spacecraft.Meteorological astronautical systemprovides meteorological observation information in regions or in the world forusers.In order to estimate reliability of information obtained from meteorologicalastronautical system,reliability of information obtained from one or several spa-cecraft has been estimated respectively in this article,meanwhile informationestimation matrixes have been obtained.Finally,the estimated value of lowerlimit of credibility is discussed.