Abstract: This paper uses the shallow-water model to discuss the characteristics of the rotating flow over the mountain. The results show that the flow has such features as follows: If Froude numer Fr is greater than 1,then there exist wave-type flow. "jumping flow" or “breaking" flow respectively on the backward of the mountain; While if Froude number Fr is less than 1, then exist the "breaking" flow only. Mountain wave is asymmetric with regard to symmetric mountain.