The coupling between local dent, perforation and whole bendingdeformaion of thin-wall circluar tube under lateral impact by blunt missile andthe ballistic limit speed of steel tubes filled with high-pressure liquid are in-vestigated. The impact tests of full-scale model are completed by Drop Ham-mer RIG. Some new phenomena are observed and important data are record-ed. It is conclused that the ballistic limit decreases with increase in the pres-sure of water. The failure model of pressure pipeline impacted by blunt missileis plugging.