Many developed countries, especially the earlier developed country which have developed traffic and densely populated, their pipelines about 20%~40% are almost out of use. If excavate of the ground for changing pipelines will spend a lot of money and time. Taiwan’s sewer pipes are density in every region, especially in metropolitan areas. Pipes often water leak and a lot of water penetrates the ground every day. Why does problem occur? Because of the pipes are too old, corrosion and gravity extrusion to make the pipes rupture then water leak.