In the light of the limitations of conventional P-wave seismic data in fault detection, lithologie & fluid i- dentifications and so on, 3D3C seismic technology adds the converted wave information and enhances the tested re- liability of the gas reservoirs and fluid boundary. In 2006, 3D3C seismic technique was conducted in Daqing Lama- dian Oilfield. The research resuhs show that the interpreted P-wave and converted wave by 3D3C seismic data and the following elastic parameters:the Poisson ratio, P-S wave velocity ratio and so forth jointedly inverted by the a- bove data can directly predict the gas reservoirs and lithology, and moreover the predicted results are very accordant with the facts, thus the reliability and accuracy of the seismic prediction of oil and gas reservoirs are improved.