Through numerical solution of the dimensionless integral equations of the turbulent buoyant plume in stably linearly thermally stratified environments, the transportation laws of the buoyant flux, momentum flux and other parameters in the axial direction as well as the neutral buoyant force height and the maximum plume height are obtained.

The assembled sampling,which combines ceiling and vertical pipes,can overcome the adverse effect of thermally stratified environments,and have high coping ability in various fire situations,especially for small fires.

By making a evaluation index system and using AHP to determine the evaluation factor's weights,this paper builds the valuation model of eco-environmental stability of Tibet and uses the overlay function of raster-GIS to make a result map,and finds the distribution characteristics of eco-environmental stability of Tibet based on the analysis of result map.