Electroconductive high polymer,two parallel conductive heart yarns and insulated protective jackets form the self regulating heating tape.For the PTC characteristic of the high polymer, the self regulating heating tape can output power self-regulated with the change in temperature,so that the temperature can then be self controlled.This product can be cut freely,heat can be emitted even when its quite short.Crossing and winding are permitted.Especially useful in heating the valve and apparatus etc.