Abstract: Fluvial sand body is the main carrier bed and reservoir in middle-shallow layers of Chengdao district. The results indicate whether the channel and source fault are connected is the premise of hydrocarbon migration in Fluvial sand body and the structural background influences the direction of hydrocarbon migration. The transporting capacity of sand body in river channel is the best, embankment is the secondary, floodplain sediment is the worst, the transporting capacity of fine-grained sandstone is the best, sandstone is the secondary and the siltstone was the third. The physical properties of the lower limit of migration sand decreases with the increase of depth, the better connectivity of sand body, the better migration performance of sand body. According to the basic types of sand body macro-connection, three types of sand connection patterns are established, i.e. thick sand body direct connection, micro fault connection, and thin or poor physical property sand body connection, and the migration performance evaluation plan of sand bodies in middle-shallow layers was provided.