Abstract: With the intensification of global climate change and the late stage of urbanization, urban waterlogging has become a key issue restricting the sustainable development of high-density coastal cities. Selecting Xiamen City as a typical sample, based on its unique natural geographical features, monsoon climate conditions, and high-density built environment, a multidimensional analysis method is adopted to systematically deconstruct the formation mechanism of the "flood flood tide" composite waterlogging disaster, and propose a "spatial control risk assessment system governance exceeding standard response" flood tide collaborative governance framework. The research results can not only provide a basis for developing differentiated disaster prevention strategies for similar coastal cities, but also help promote the paradigm shift from single engineering governance to multi system coupling regulation, ultimately achieving the coordinated improvement of urban water safety and living environment quality.