The relationship between respiratory tract disease and the meteorological conditons in Beijing area is analyzed by using the 712 cases of adult sick people from a hospital in Beijing and the data of daily air-pressure, temperature, humidity from the Beijing Observatory. The monthly variations of case numbers of respiratory tract disease are given. The results show the relationships between the fluctuation of meteorological conditions in Beijing and the more or less change of case numbers of respiratory tract disease. The regressive equations for forecasting respiratory tract diease classification month by month are given too.