Abstract: Abstract:Latest exploration examples in recent years show that the economic benefit of subtle oil-gas reservoirs exploration is increasing, which is even more than that of conventional structural traps. Based on the classification of subtle traps in the world, they are divided into three types, namely lithologic-stratigraphic trap, hydrodynamic trap and composite trap.While lithologic-stratigraphic trap can be subdivided into three basic styles, including sedimentary trap, diagenetic trap and interface trap. At the same time, the development status of exploration technology on subtle reservoir is introduced from four aspects such as geology, geophysical survey, drilling and well log.