The Dajinglong bridge in Fujian province needs to be demolished by blasting due to road reconstruction,which is a reinforced concrete structure with length of 187 m and width of 24 m.There are 5 rows of piers and 6 spans,and span length is 30 m.The surrounding conditions are complicated.The maximum vertical distance between the bridge and the road under the bridge is 29 m.It is necessary to accurately control the hazards such as blasting flying rock,blasting vibration,and touch ground vibration.Through theoretical analysis and numerical simulation with ANSYS/LS-DYNA to simulate three pre-selected schemes,symmetrical initiation,one-way initiation and intermediate initiation.Comparing the blasting pile and the magnitude of the touch ground vibration,it is found that the intermediate initiation method is the best scheme.By comparing the simulation results of the delay time between different rows,the original design of the short-delay blasting scheme was optimized,and finally the blasting scheme with intermediate initiation and long-delay time was adopted.At the same time,measures such as pre-paved buffer layer,multi-layer winding protection and sand embankment protection are adopted to control blasting hazards.The on-site blasting outcomes show that good blasting results have been achieved after adopting the optimized scheme and vibration control measures.The actual blast pile shape of the bridge is roughly consistent with the simulation results.The peak vibration velocity of each monitoring point is relatively close to the simulation results,and meets the requirements of the surrounding important facilities.