In the 1980s and 1990s,the Supreme Court of the United States heard a series of state-level coastal land control litigation cases,taking the Lucas case in 1992 as a typical representation,which had a wide impact on the American society from multiple dimensions,and its origin was also complicated.The vigorous development of the modern environmental movement and the destruction of the natural ecosystem in the coastal area make the state government have to control the disorderly development of coastal land.But the demarcation and application of the boundary of the government expropriation power gives the property owner the legal basis to appeal the claim.In addition,the complexity of the existing regulatory collection standards provides both parties with self-interested precedents.Therefore,when the firm determination of the state government to control disorderly development and the strong attitude of property owners to protect private land inevitably collide in a specific time and space,it will inevitably lead to a series of litigation cases on coastal land control of the US state government.