College of Geo-exploration Science and Technology，Jilin University，Changchun 130026，China

In the north of Ordos Basin，the thin tight reservoirs in Tabamiao area of Daniudi gas field dev- elped well． The authors construct seism forward modeling for thin bed and thin- interbedding under different kinds of reservoir conditions by rock physical parameters． The results show that the pre- stack seismic response is complicat- ed in thin bed，especially in thin- interbedding，which is different from the change regulation of normal AVO type． The seismic response characteristics of the dry beds are obviously different from the gas- bearing beds． Based on the pre- stack seismic response characteristics and different change regulation，the research of thin bed in detail can be carried out，which helps us to identify the type of reservoirs．