Abstract: Igneous rock developed in Wulanhua depression of Erlian Basin. It belongs to eruption rock represented by basic basalt of the Neogene Hannuoba Formation. The shallow layers are of the extrusive facies while the middle and deep layers are of the volcanic aisle facies. The surface of the igneous rock area fluctuates significantly, with eruptive rock piled miscellaneously, the weathering layer is thin and the lateral velocity changes quickly, causing a low original single-shot signal-noise ratio. Therefore, the quality of data is relatively poor. In the light of the above stated geologically geophysical characteristics, technological study is made in three areas – the optimization technology for the observation system with wide azimuth, large offset and high fold to enhance weak signal of deep igneous layer, the optimization technology for vibroseis and explosive excitation factors to improve the quality of original data, and the accurate surface structural investigation and comprehensive static correction technology to solve the complexity and changeability of surface structure. The results of the study indicate that those technologies can solve the bottlenecks in 3D seismic exploration of Wulanhua depression covered with igneous rock.