Based on the physical and mechanical test data of dredged coral reef,applying the theory of coral reef deposition and structural characteristics,the dredged coral reef rock are divided into three categories:tubular coral reef,honeycomb coral reef and dense coral roof.From the perspective of coral reef characteristics,this paper analyzes the influence of reel type,particle composition and failure strain rate on the shear strength.These results show that:1)cohesion (c) and internal friction angel(φ)have the same rule:tubular coral reef without filling＜honeycomb coral reef with filling coral sand＜dense coral roof with filling calcium cemented calcite.2)The correlation between the internal friction angel(φ)and the content of particle size greater than 5 mm is the best,whose regression coefficient is 0.862. 3)c and φ increase rapidly with the increase of axial strain.When shear strength reaches the peak value,the required strain rate is 0.018%～0.082%.The damage types of coral reef are always in three forms of shear,split and crack rupture.