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The Third and Fourth Members of Denglouku Formation ( K1 d3 and K1 d4 ) are the important gas productive reservoirs in Changde gas field��Songliao Basin�� However��the interfaces of K1 d3 and K1 d4 have been confused in definition before��which impeded the oil and gas exploration�� The authors studied the characteristics of K1 d3��K1d4 and key interface by lithological��logging and seismic analyses��and adjusted the defination of the interfaces based on their characteristics�� Lithologically��the K1d3 and K1 d4 mainly are composed of mudstone��developing lacustrine and meandering river facies�� In the K1 d3��the resistivity curve presents high frequency��mediumhigh amplitude��and finger or box shape�� The base surface of K1 d3 is the bottom boundary of sandstone and top boundary of mudstone��and the gamma ray curve shows negative step shaped��while the elective resistance shows positive step shaped with onlap and toplap characteristics in seismic profile�� In the K1d4��the resistivity curve presents medium-high frequency��medium amplitude��finger and box interbed shape�� The base surface of K1 d4 is the bottom boundary of mudstone and top boundary of sandstone��and the gamma ray curve shows positive step shaped�� while the elective resistance shows negative step shaped with concordance characteristics in seismic profile�� Thus�� the definitions on the imferfaces of 12 wells in the bottom of K1d3 and 8 wells in the bottom of K1d4 were adjusted��