Major progress in the study of natural gas geology since the 6th five year plan are as follows: 1.put forward the geological theory of transformation from coal basin into gas(oil) basins; 2.put forward the multi source

multi stage and multi phase gas reservoiring theory; 3.put forward the “basin geotherm hydrocarbon”theory based on the thermal system and geodynamics; 4.put forward various reservoir models composed mainly of late and ultra late hydrocarbon generation and pool forming; 5.summarized main controlling factors of large and medium gas fields in China and the strategy of natural gas exploration in the early years of the 21th century.