Though there is a great impact of thermal bridge in a building on its energy consumption,whether the building in hot summer and cold winter region needs an insulation against the thermal bridge is still in discussion.Through quantitative simulation study of the projects with different architectural forms in three representative cities from the hot summer and cold winter regions,the effect of the percentage of thermal bridge area and of the existence or not of insulation layer at the location of thermal bridge on the building energy consumption is analyzed.It shows that the energy conservation measures should be considered in building design for the thermal bridge location of the building in hot summer and cold winter regions.