Based on a tour of investigation and academic exchanges at IHC Merwede, the largest dredger builder in the world, four international dredging contractors , i.e. Van Oord Dredging and Marine Constructors bv,Boskalis International bv, Jan de Nul Group and DEME (Dredging, Environmental & Marine Engineering), and some under-construction project sites in Europe, this paper gives some insights and suggestions from aspects of codes’compiling, dredger building, investigation, engineering and construction of dredging works, and the development of dredging industry in China.