Abstract: Utilizing a simple theoretical model, some dynamic processes of ultra-long waves in the troposphere as well as in the stratosphere are studied in relating to the heating and orographic influences.Owing to the existance of both orographic and thermal factors, the ultra-long waves fluctuate and intensify about a certain geographical location, this may explain the maintenance of quasi-stationary large troughs in the mid-troposphere.It is also found that the amplitude of ultra-long waves varies periodically with a period of 10-30 days, and Further that the period depends upon the scale of motion and the structure of circulation.When the parameters of the atmosphere remain unchanged in an unlimited time, the field of motion tends to become steady.