Through a summary of different types and development and utilization modes of available resources in tidal flats, the impacts of development and utilization of tidal flats on hydrodynamic conditions, sediment erosion and deposition, stability of the main channel and flood plain, the ecological environment, biodiversity, and other marine resources in the coastal zone are examined. Models for evaluating the environmental impacts of development and utilization of tidal flats mainly include the ecological-economic model, multi-index analytic hierarchy model, and DPSIR model. According to some significant aspects of the environmental impacts of development and utilization of tidal flats, a few aspects that require attention during the process of planning and implementation of development and utilization of tidal flats are summarized. Finally, protection measures for coastal wetland resources, biological resources, and the ecological environment in reclamation areas are put forward.