Abstract: According to the theory of the least cost of timber skidding and transportation and the local facters of the northeast China, includding the forest resource, the natural condition and the forest roads, this research sets up ascientific method of planning forest roads, and a way of determining reasonableskidding distances and road separations. This paper makes the forest skiddingroad planning system more perfect and the theory of the forest road networkmore appliable.

Key words: Forest road, Planning, Road separation