Abstract: Abstract:The subsalt oilfield has distinctive features of a biogenetic origin and is a new field for exploring oil and gas. There are three key problems in the exploration of subsalt oilfields, i.e., new geological concept, applying reverse time migration in seismic data processing and special techniques in drilling. As 90% of oil fields coexist with salt, salt might be a prospecting indicator for the oil and gas field. Precise imaging of salt using reverse time migration can improve successful rate for exploration of subsalt oilfields, and at the same time it can get precious information concerning salt. The exploration of oil and salt at the same time seems to be an effective policy.