The invention relates to a dissociation agent, a dissociation technique, a flexible display device and a production technique of the flexible display device. The dissociation agent is reductive and comprises at least one solution of oxalic acid, hydrochloric acid, hydrogen sulfide, hydrogen sulfide, ferrous sulfate, sodium sulfite, stannous chloride, potassium borohydride or sodium borohydride. The production technique is characterized in that a flexible film substrate is produced on a base plate, then a film device is produced on the flexible film substrate to form a primary body, and finally the flexible film substrate of the primary body and the base plate are dissociated through the dissociation agent to form the finished flexible display device. By adopting the dissociation agent and the dissociation technique, the flexible film substrate and the base plate can be dissociated easily, fast and conveniently. According to the flexible display device and the production technique of the flexible display device, production of sacrificial layers is avoided, and the produced substrate is directly dissociated from the base plate. The process is simple, production is convenient and dissociation is fast.