This paper takes the trespassed fishing, illegal sea sand mining and floating waste as examples from the view of spatial planning of Kinmen and Xiamen Sea Area exploring the difficulties of enforcing the law and implementation of the three topics mentioned. From the relationship between central and local government, the importance and necessity of establishing spatial planning of Kinmen and Xiamen Sea Area would be discussed. Through the literature review and case analysis, the current situation of trespassed fishing, illegal sea sand mining and floating waste, the difficulties of collaborative law enforcement and execution between the local Governments across the Strait, and relationship of central and local government for the spatial planning of Kinmen and Xiamen Sea Area, would be discussed in details. The result shows that the trespassed fishing, illegal sea sand mining and floating waste in Kinmen and Xiamen Sea Area have seriously impacted the fishery resources, environment and maritime safety, and the difficulties of collaborative law enforcement still requires the local Governments of Kinmen, Xiamen, Zhangzhou, and Quanzhou to cooperate and break through together. According to the study specified above, this paper suggests: (1) Kinmen becoming the pilot area for the cooperation of the local Governments across the Strait; (2) establishing "Greater Kinmen and Xiamen Sea Area Spatial Planning" for Kinmen, Xiamen, Zhangzhou, and Quanzhou; (3) providing a number of specific measures solving the problems mentioned above.