PTFE powder with high performance is used to push (squeeze) into the pipe, the surface is chemically treated, and then it is lined into seamless steel tube (the outer diameter of the liner is slightly larger than the inner diameter of the steel tube 1.5-2mm) to form a seamless liner.To relieve the stress, it is placed in a furnace and heated to 180 degrees for constant temperature treatment, so that it is suitable for use in temperatures below 180 degrees.At the same time, the axial tensile strength of push (squeeze) pressure pipe is obviously better than that of winding pipe, which can be used in micro-negative pressure pipeline.