In recent years, with the improvement of the radiometric tecbnique, rema-rkable advances have been made in the application of radiometric method to the prospecting for oil and gas fields. Portable microcomputerized instruments and equipments have been developed. In field work, high-precision and multi-parameter radiometric survey has been carried out; in indoor work, radiome tric stations have been utilized to undertake data processing and interpretation. Through integrated investigation of some oil and gas fields and model experi mentation on migration regularity of radioactive elements, new understanding has been gained concerning the relationship between radioactive anomalies and oil-gas accumulations and the formation mechanism of anomalies. Lots of case studies demonstrate that radiometric method is a simple, convenient, rapid, economical, practical and safe method in search for oil and gas fields and will surely yield good economic benefits in petroleum exploration.