To use characteristic quantity of safety grade divide five safety grade, this paper disposes consequent according to apply example and gets itself conclusion.

Based on three Landsat TM images of 1984, 1996, 2001 and one "Beijing-1" data obtained in 2005, the land use characteristic of Beijing between 1984-2005 was concluded.

No one architecture has a singular focus, but the degrees to which an architecture implements a given characteristic defines its market and appropriate use models.