Experts believe that now are mostly take cover engineering and pipeline engineering construction pipe, if the pipe improper selection, according to expert estimates, will give investors the pipe material 10 ~ 20 times the value of economic losses. Other pipes material and water industry development and progress of a barometer. Feed water pipe 5 selection principle: safety and reliability, economy, health, energy conservation and sustainable development, this is also the green pipe of a few big characteristics, only to be able to meet the principles of pipeline is really good. Strength comparison of water industry is the most commonly used stainless steel stainless steel 304 and 316, they can meet most of the water treatment and transportation conditions. The tensile strength of 304 stainless steel pipe is a steel tube 2 times, 3 ~ 4 times that of copper pipe, plastic pipe of 8 ~ 10 times. The strength of the material to determine whether the pipes strong resistance to bump, safe and reliable. Safe and reliable and is the most important building to the water requirement. In by external impact, the possibility of stainless steel pipe leaking, and copper pipe and plastic pipe leakage rate is relatively high, pipeline construction or secondary decoration could easily damaged. Major domestic cities in complaints is the main reason of the leakage, the plastic pipe leaking are a main reason is that the plastic pipe outside force impact.