If the dredger fill is sandy and the fill area is silt layer,it is difficult to solve the damage problem of silt caused by the dredger fill in the filling process by traditional blow-filling construction,which will cause a large amount of silt concentration therefore great difficulty in subsequent foundation treatment construction.If the silt layer in the fill area is too thick and the fill construction speed is too fast,the conventional fill construction may also cause the landfill to be unstable.Combined with the Panama Colon Container Port(PCCP)project,the slope stability theory is used to explore the application of stratified block filling in ultra-thick silt bottoming area .The construction process of a block layer fill is for reference of related projects.