Abstract: Based on the comprehensive compact of natual factors and human being activities,there exists a good interrelation between the shape and land type of forest land compartments.This paper quantitatively describes the shape characteristics of forest land compartments adopting shape index(SD),reveals a regular pattern of shape index and different land type property.On the top of this regular pattern,a deep logic check on defining forest land border is raised.

Key words: forest land border defining, compartments, shape index, land type, property data, logic check