Abstract: In this paper,the resource evaluation expert system of depressions and traps is used to evaluate the gas-bearing possibility of 58 major traps in the Quantou Formation and Denglou Formation of the South Songliao Basin.Among them,twenty are regarded as favourable gas-bearing traps.These favourable traps have advantageous pool-generation geological conditions.After drilling,some traps have obtained industrial gas/oil or shows.It is indicated that this evaluation technology has higher reliability.So these traps can be selected as major targets for the natural gas exploration of the South Songliao area in the future.