Abstract: The pulsed neutron well logging is a logging technology that the geological and project parameters of oil saturation, porosity and water flow can be determined by recording gamma ray or thermal neutron, which are produced through reaction of fast neutrons produced by pulsed neutron source with nuclei in bore hole and formation material. Several kinds of logging technology to determine oil saturation and oxygen activation water flow, as well as the introduction and application of these instruments in domestic, were sketched out. The research and development of neutron lifetime and carbon oxygen ratio spectrum logging instrument in domestic were summarized simultaneously, and the prospect and breakthrough in pulsed neutron well logging technology in our country were elaborated.