Abstract: This paper discusses the effect of solar insolation on reinforced concrete tall buildings with tubu- lar structure composed of thin walls and members,and analyzes the thermal stress and deformation induced by solar insolation.Some derived practical formulas based on certain assumptions are pres- ented.The structure of Sichuan tower building in Shenzhen has been used as an example to illustrate the calculation procedure with certain conclusions drawn at the end of the paper.