Abstract: A kind of pipeline creeper orientation system with low frequency alternation magnetic field as controlling information carrier was introduced. The system includes magnetic instruction source, magnetic receiving apparatus and pipeline creeper. It was adopted low frequency alternation magnetic field which could penetrate steel tube from magnetic instruction source as orientation signal, replacing the method with radioactive isotope(such as 137Cs) as orientation signal. This machine was widely used in the nondestructive testing of gas tube weld seam in the so-called west-to-east gas transportation line. It has several characteristics such as safety and reliability, easy to handle, high orientation precision, convenient carry, easy realization and wide applicable range and so on.