The long reach excavator’s boom and arm length totals 15 meters with a 0.4 m3 bucket, which is developed on the base of market research and thorough technical argumentation. In terms of the design, materials, technologies and manufacturing process, the structural strength, performance and quality are completely guaranteed. There is damping plate inside the boom, which can greatly improves the load bearing capacity and the service life. It is mainly applicable to the dredging, slope grading, foundation construction and deep excavating work.