Abstract: Freshwater lens, as the main or even the only freshwater resources of island, it’s law of evolution in the condition of nature and exploitation has become the primary research content of island freshwater resources use and management. Using self-study model to simulate freshwater lens evolution at laboratory, it’s formation process in the condition of rainfall has been simulated, the process of upconing movement has also been simulated without any recharge. When the pumping rate reached 3.73 × 10^-5m³/s,the upconing moved into pumping well and the freshwater lens was breakdown.

Key words: freshwater lens, laboratory simulation experiment, transition zone, upconing