Research methods: The paper analyses the design condition of varied area, and list out the issues should be noticed when design of the highway subgrade. According to these analyses, the author gives some research and consideration to all these issues.
Research results: According the analysis of the design of highway subgrade of varied area, the author puts forward advises about the suitable height of highway subgrade. And according the experience of design, the author also puts forward some methods to improve the design of height of highway subgrade.
Research conclusions: (1) At mountain area, on the basis of the formal require to the highway subgrade , we must lay emphasis on environmental protection;(2)At flat country , we should do our best to lower the height of the embankment; (3) At weak soil area, we should pay attention to the influence of sedimentation.
2007, Vol. 24 
