The steel-constructed platform of air-cooling island for 300 MW air-cooling units in one thermal power plant is used for allocation of the air-cooling condenser and the cooling blowers.The features of said platform are as follows: large span of structure

big height

overwide of rised hanging members

complex connection of structure

heavy equipment supported

and complicated influence of working load and environmental effects

such as earth squake and wind load etc..Experiences for designing this new type structure in our country remain to be accumulated.considering five kinds of load

including dead load

live load

wind load

snow load

and earthquake load

a parametric model for the steel-constructed platform of air-cooling island has been established by using APDL of the finite element software ANSYS

and its mechanical analysis being carried out

providing with good basis for further designing.