In this paper, the method of the construction protection on the chimney at danger is detailed introduced and the economic effect is presented through the foundation construction of the experimental building five meters away from the morth of the chimney in a plant.

The basic principles to determine the chimney height of a power plant are meeting the demand of atmospheric diffusion and saving investment,ensuring the maximum ground concentration lower than the controlling goal of the enviromnent.

By research for rational technique on the height of electricity factory chimney,the article pointed out the main effect factor of contamination falling thickness,and tested the rationality of different chimney height from weather and air influence aspect.

Has summarized a set of plan of chimney height rational proof,through rearching national standard,stipulation and method of rational-ity of the chimney height and analysing major effect factor of influencing the density pollutant falled to the ground and combinimg some examples of the chimney height rationality design.

This essay discusses the necessity,urgency,and feasibility of introducing super-high chimney to the plain area of Beijing based on the pollution status of near-ground atmosphere in that area as well as the regular pattern of the formulation and disappearance of near-ground inversion and the situation of smoke diffusion.