In order to verify the reflection seismic detection effect of large capacity air-gun on land flow water,we adopted the working mode of non-longitudinal and bending line which air gun ship excitated in the Tongling area of Yangtze river and the reflective seismic instrument received along the river bank. We obtained the reflection seismic data of the deep structure and tectonic features in the area. Although the original record has lower signal noise,the reflected wave group of upper crust and the Moho can be recognized in different parts of the record. The maximum horizontal distance of seismic wave propagation reaches as far as 21km,and the vertical depth of seismic wave propagation can reach more than 30km. Based on the characteristics of original data,we applied the combined methods such as non-longitudinal and bending line bin definition,3d tomographic static correction,pre-stack multi-domain denoising and combined deconvolution. The abundant crustal reflections are in the stack time section. The results show that the crustal structure in the area are of double layer structure,with a total thickness of 30.0~36.0km. The reflection features of uplift and depression interphase was showed in the upper crust,and there are multiple groups of laminated arc-shaped reflection waves in the lower crust. The Moho is clearly observed by reflection features,which are composed of 2~3 reflection events,showing the raise from SW end to NE. There is a deep fault cutting through the lower crust and the Moho in the area,which is caused by the Yangtze river deep fault. The above results indicate that the large capacity air-gun can be used for deep reflection seismic detection of crustal fine structure in land flowing water.