Using the present value of cost method, this paper makes economic analysis of ultralow class forest roads, which recently appeared in the forest areas in the south of China, deduces a set of universal formula which can be used in alternative comparing and decision making and gives an example and makes a sensitivity analysis.

This paper discussed the damage and cause of forest road frothing in Fujian and the prevention measures to this issue were put forward then.

In the paper, the effects of forest roads on the ecological environment are analyzed and the common problems in the process of environment protection in forest regions where forest roads are constructed are concluded and summed.

of stone built retaining walls on forest region highways in Fujian Province were analysed and studied,this paper raised various technological requirements and problems should be paid attention to so as to avoid the occarances of diseases and guarantee stable roadbeds and open highways.

Because of the bad road linear caused by tomography,the low grade highways in mountain area are the traffic accident spots.