The high-density development of the city often brings the problem of insufficient daylighting. The research and determination of daylighting standards has gone through four periods, including non-standard, geometric calculation, computer evaluation and generative design periods. KPF Urban Interface, the urban data research department of the internationally renowned architecture firm KPF, has carried out a series of practices, in which the factors affecting the daylighting problem in London Ideal Block are divided into three scales: single block, multiple blocks and district. By controlling these factors, the optimal balance between high density and daylighting can be found. A representative generative design method is adopted in this case, which has prominent advantages in six aspects: comprehensive dimensions, pre-evaluation, flexible results, efficient process, clear presentation, and extensibility. Although its application is limited, it could bring enlightenment to deal with the daylighting problems caused by high-density construction in China.