Abstract: Because the natural environment of seabed at which the pipeline located is very complicated, the sea current will produce various forces which effect to the marine pipeline and will damage to the pipeline. A new technology which firms the underwater pipeline by fiber reinforced mats is put forward. This technology has many advantages of wide application, simple construction and cost-effectiveness. It would not only solve the problems, such as low-buried depth, bared or hanging pipe of the existing pipelines, but also give a new effective way to firm the pipelines in trenchless job.