The structure and principle of hot-air-flow power generation system with vertical heat collector have been presented

the maximum output power and the energy coversion efficiency of the said system being analysed.Through analysis

the conclusion obtained is as follows:the maximum output power and the maximum energy conversion efficiency of the said system increase as the chimey height

width

and the solar radiation increase

and the impact of chimney height is most significant.At the same time

the ambient temperature has also certain effect upon the system output power.Furthermore

the maximum energy conversion efficiency of the said power generation system is smaller than that of the original structure of powre plant due to the size of said system is limited by the high buildings

but the new kind of solar energy power generation system can provide new train of thought for the energy-saving in urban buildings.