Refer to integrated transportation system projects，such as bridges and tunnels，the drainage design of artificial islands has become a key factor for safety and flood prevention. We take the integral drainage physical model test and drainage design of the Shenzhen-Zhongshan channel project as an example，optimize the integrated physical model，simulate the superposition condition of the random overtopping and actual rainfall superposition，and apply it to the drainage design of artificial island under the gravity flow and pressure flow. At the same time，comparing with the Hong Kong-Zhuhai-Macao Bridge project，we summarize the essentials，trends，and development directions of artificial islands physical model test and corresponding drainage design. The results show that the drainage physical model test should be combined with the integral and local tests，simulating conditions of the random overtopping and actual rainfall，which can significantly improve the accuracy of the test.