针对复杂环境下城市高架桥爆破拆除工程的特点，提出了其精细爆破的关键技术。提出采用墩柱爆后钢筋骨架的初弯曲压杆失稳力学模型和高架桥连续塌落动力学模型等进行关键参数的定量化设计，运用水压爆破技术对多室箱梁进行爆破破碎，采用“宽间隔、长延时、互动有序”非电接力交叉复式起爆网路可确保超长延时起爆网路的安全准爆，采用物理模型试验方法对爆破方案、关键参数等的合理性进行验证，采用多种综合防护技术进行有害效应的预测与控制，采用专业化、协同化、精细化、执行力(SCPE)的项目管理方法进行爆破拆除工程的精细管理。该精细爆破关键技术可为复杂环境下城市高架桥爆破拆除工程实践提供参考。

Key technologies of precision blasting were put forward based on characteristics of urban viaduct blasting demolition in complicated surroundings. Initial bending instability mechanics model of reinforcing steel bar frame of blasting fragmented pier and sequenced collapsed dynamics model were established for quantitative blasting design. Technologies of water pressure blasting were applied in multi-cell box girder fragmentation. The initiation network of non-electric duplication crossover was adopted for safety and reliability of ultra-long delay. The rationality of blasting scheme and parameters were validated by physical model test. Adverse effects were forecasted and controlled by integrated protective technologies. Specialization cooperation，precision，execution（SCPE）project management method was put forward for precision management. Key technologies of precision demolition blasting can provide reference for similar projects.