Abstract: Under the background of global sea-level rise,the range of coastal erosion has become larger,and erosion degree has become more and more serious in recent years.Coastal erosion disasters have threatened the survival and living environments of coastal zones,and have gradually brought a great economic loss.Until now,occurrence mechanism and stability evaluation of coastal erosion disasters have not been fully understood yet.A majority of researchers at present are focused on the impact of wave,storm surge and other objective factors on coastal erosion.The geological factors including lithologic conditions,rock and soil mechanical properties and bank structures are seldom studied.Therefore,this paper points out that further investigations on coastal erosion disasters shall be strengthened on the following five issues: (1)correlation between coastal erosions and geological environmental conditions; (2)regional characteristics and law of development and distribution of coastal erosions; (3)deformation and failure modes of erosion banks; (4)mechanical properties of rocks and soils under different erosion factors; (5)evaluation mechanism of coastal stability.