Abstract: Described in the paper are the applications of the plastic-coated steel tubes for such purposes as architectural water supply, sewage treatment, chemical industry, petroleum and natural gas industries, express way rail, tapered electrical pole, pharmaceutical industry, power plant, cross-over strait bridge prop and service at the moderate temperature of 260 ℃. Based on comparison of the excellent performances of the plastic-coated steel tube with the performances of seminar products, it is concluded that as a long-term effective, energy-saving and environment-friendly product, the plastic-coated steel tube is suitable for a wide application scope, having an encouraging potential market.