The discovered subtle traps are divided into three genetic types, including stratigraphic#lithologic trap, complex subtle structural trap and combination trap. According to the main controlling factors for the trap forming, each of these types includes nine simple$factor controlling subtle traps and one complex%factor controlling subtle trap. The nine simple factors include reservoir body, reservoir space, sealing condition, migration and filling&up condition, trap shape and framework, trap position, dynamic condition of trap forming, reservoir fluid property and preservation condition. The current basic theories and techniques of the exploration for subtle traps are summarized, and the combination ofmultiple techniques is stressed to be the foundation of subtle trap exploration.