To dismantle a simply supported and then continuously prestressed reinforced concrete bridge,we adopted the blasting demolition scheme of split section in-situ collapse,based on the structural characteristics of the bridge and its distance to the surrounding buildings(structures).The short pier without a tethered beam had a diameter of 1.4 m and a height of 3 m,and the spacing between holes and rows were 30 cm and 50 cm,respectively.Meanwhile,the long pier with a tethered beam had diameter of 1.8 m and it was blasted by two sections separately.The blasting height of the section above the tie beam was 3 m and that of the lower section was 4m.The hole spacing was 40 cm,and the row spacing was 50 cm.Continuous charge was used in the hole,and electronic detonators were used for top detonation.The collapse-touch ground vibration was controlled by flexible collapse achieved by varying delay times.We adopted 4 layers of protective measures to strictly control flying stones.The blasting results showed that:the blasting network parameters were safe and reliable,and flexible collapse was achieved.The collapse vibration was reduced by controlling the flying stones so as to achieve a good blasting effect.