This paper states the computation formula of forest coverage and forest virescence ratio,technique standard and computation range and method of various land type in the main technique regulation of forest resource plan and design in- vestigation promulgated by national forestry bureau.

The research on insect pests of the ornamental and afforestation trees in Yangling Demonstration Zone showed the harm of the major insect pests to them, especially the harm to garden scenery, to urban environment and to life quality of the urban citizens.

Study of hardiness of trees against SO_2 pollution in steel mill;