Abstract: Pipeline ice plug phenomenon often occurs in oil product pipeline in high and cold region. In case of complete plugging condition, oil injection pressure test shall be used to calculate the length of oil injecting section with injected oil amount and pressure change to define the basic location of the plugged point. In case of incomplete pipeline plugging, pig with signal sending function shall be launched for tracing detection; or emit pressure wave into pipeline to measure its return time in order to calculate basic location in pipeline pluged, in which, also provides corresponding measures for preventing pipeline from ice plug.