Recently, Bayuquan Branch Company of Angang Steel Co., Ltd. independently developed and manufactured Generation II automatic control device for slab strong cooling. The device is integrated with slab cooling system, slab temperature control system and steam collection system. After application, slab strong cooling process control is more stable, operation is more convenient and surface grain boundary cracks produced during thick slab direct delivery rolling are solved. Meanwhile, it reduces slab offline percentage and makes the percentage of directly hot delivery of heavy slab increase by 18% in average comparing with last year.