The aim of this topic is to indicate the advantages of dynamic daylight performance metrics and advocate the acceptance of dynamic metrics in analysis of building daylight design cases. Firstly, this paper indicates that the dynamic metrics are more reasonable than statistic metrics (daylight factor) in evaluating the daylight environment via theoretical analysis. Then taking the weather data in Guangzhou as the calculation input, based on Daysim simulation results, the depth of daylight available area is defined by DA metric. Under the regional weather condition in Guangzhou, based on Daysim dynamic daylight simulation data, the daylight performance of 4 facade types is ranked via metrics DF/DA/UDI and compared with that ranked by daylight factor, and the result indicates the superiority of dynamic metrics in selecting the optimal design schemes. Furthermore, the daylight available area and probability of glare occurrence towards facades with various WWR and shading overhang size are analyzed, and the results can be adopted as design references which suggest that the dynamic metrics should be used to evaluate daylight performance and the areas where DA metric values are no less than DA_300 lx[50%] should be defined as daylight available area that could indicate the availability of side-lit windows well.