Analysis of ship clutter in MMW sea fog detection radar data sea fog detection radar will be interfered by many sources of clutter, and the analysis of these clutter is the basis of improving the sea fog detection effect. In this paper, the ship clutter in the MMW sea fog detection radar data is analyzed, and the characteristics of clutter interference caused by the ship are counted. The separation of ship signal and weather echo is realized, and the data quality of sea fog detection is improved. By further mining the information contained in the clutter, multiple information such as the length, speed and course of the ship is extracted. The potential of weather radar in ship identification is preliminarily explored.