Boulders and bedrock intrusion in shield tunneling has become an important factor affecting tunneling efficiency and leading to the increase of tunneling cost.Combined with the engineering practice of hard rock blasting of open shield tunnel under complex urban environment,the design and selection method of hard rock blasting parameters of shield tunnel and safety protection measures were introduced in detail.In addition,the rationality of the blasting parameters was verified by numerical simulation using LS-DYNA dynamic finite element software.The blasting results show that there are some blasting craters with scattered cracks in the tunnel face after blasting,which provides good working conditions for shield tunneling and effectively improves the tunneling efficiency.Compared with the common mining method and the ground drilling method,loosening blasting can reduce the overbreak phenomenon of the tunnel with less influence on the surrounding structures.It can also realize the goal of safe,efficient and continuous excavating of shield tunneling,which can reference for the design and construction of similar projects.