Abstract: In pipeline engineerings, the reliability indexes on the partial or overall structure of pipeline can be calculated according to the reliability theory concerned, thereafter, the reliability of the structures can be evaluated with these indexes calculated. On the reliability evaluation, there are many indexes available for pipeline engineerings. For instance, failure rate, λ, reliability, R, and availability, A are used as indexes by U. S. A., while reliability, H, preparation coefficient. K_r. used by the former U. S. S. R. The paper lists the equations on calculating these indexes and introduces some foreign information about reliability indexes. The reliability for a pumping station, which is made up of a series of elementary equipment depends on the reliability of every elementary equipment and its combination form. Accordingly, the reliability model of this system can be established, generally illustrated with reliability logic diagram. The database for evaluating the reliability of oil and gas pipeline systems has been developed by the concerned organizations in some countries.