Abstract: Aiming at the technical problems of uneven energy distribution，difficulty in vibration con⁃ trol and prominent risk of slope instability in the blasting of the fracture zone of an open-pit iron mine，the optimization of mixed charge structure，digital electronic detonator millisecond initiation network and pre�splitting blasting are proposed. In order to ensure the safety of construction，a whole process safety manage⁃ ment system including drilling detection，dynamic parameter adjustment and integrated monitoring is con⁃ structed，and a data statistical evaluation model is established to verify the effect. The engineering applica⁃ tion results show that after the implementation of the optimization scheme，the utilization rate of blast hole is increased by 15%~20%，the half hole rate of slope is stabilized at 60 %~80 %，and the blasting efficiency and operation safety in the fracture zone are significantly improved. Through the innovation of technical scheme and the construction of safety management system，this study effectively solves the core pain points of open-pit blasting under complex geological conditions. The results can provide important theoretical sup⁃ port and engineering practice reference for the optimization of blasting technology and safety control in simi⁃ lar mine fracture zones.

Key words: open-pit iron mine, fracture zone, blasting technology optimization, millisecond blast? ing, presplitting blasting