A 110 m thin wall reinforced concrete cooling tower has been demolished by controlled blasting.Aiming at the characteristics of large height,thin wall and large bottom diameter of the cooling tower,the blasting scheme of “opening window,breaking steel bar and reserving supporting plate” was adopted.In the pre-demolition process,two simplified directional windows were set up along the edge of the blasting zone by optimizing the blasting incision of the cooling tower.In the blasting area,only the bottom and top of the herringbone column of the cooling tower were blasted,and the blasting incision was divided into 5 blasting areas using the non-electric millisecond delay initiation technology.In order to control the damage effect of blasting,laying buffer soil layer and steel plate in the collapse direction of the cooling tower for double protection effectively reduced the collapse touch vibration.The protective measures combined with mesh and geogrid covering at the blasting incision effectively controlled the flying stones without causing damage to the surrounding structures.The blasting effect shows that setting two simplified directional windows on the edge of the blasting incision not only cuts down the drilling and related workload,reduces the safety hazard and the difficulty of protection,but also improves the structural stability of the pre-treatment part and prevents the blasting incision from falling.Through the simplified design of the directional window,the cooling tower distorts and disintegrates fully in the collapse process,with a concentrated explosion pile and small ground vibration.