Abstract: This article proposes a tower-type thermal-photovoltaic composite power generation system using spectral beam splitting technology, and introduces the composition and structure of the system.The mirror field arrangement was designed using the MUUEN algorithm, and the proposed system was analyzed optically and thermodynamically at the AM1.5D solar spectrum as the incident irradiance flux density. Solar radiation data for a typical meteorological year were used to forecast and compare the full-year power generation of photovoltaic power, solar thermal power and this system.The results show that the combined power production of the towertype sub-spectral thermal-photovoltaic composite system is higher than the other two systems under the selected climatic conditions.