In the channel for which ebb and flow is obvious

how to determine the minimum embedment depth of cofferdam under the force caused by wave and flow for the design of the cofferdam

ensuring the construction safety has important and practical value. In this paper

the threedimensional source distribution method is adopted to establish the mathematical calculation model of wave force for large scale structures

and superimposed by "General code for design of highway bridge and culverts" related formula of current force

to determine the cofferdam structure for the wave flow combination reaction. And then through the actual project of the steel sheet pile cofferdam in the "strong current

weak wave load combination" and "strong current

strong wave load combination " of cofferdam for the minimum depth of embedment of application examples

the feasibility of the method was verified. Finally

we discussed the wave flow combined with rectangular cofferdam structure displacement and angle relationship

and the factors affecting the cofferdam embedment depth make the multi-parameter analysis

and some beneficial conclusions are drawn.