Due to complex geology of the Tanjiaba slope section of Enshi National Highway 209,fly rock was generated during blasting.According to the surrounding environment characteristics and the specific situation of cutting slope mountain section,a method to guide possible fly rock to a safe place was proposed combined with the advantage of the minimum burden principle,the multidirectional blasting action control principle and the group charge interaction principle.First of all,the short-hole and small bench height blasting was used to create a new lateral free surface for the main blasting of slope cutting,and then a deep-hole bench blasting method was carried out.The slope was descended sequentially in three small benches to reach the height of a deep-hole bench blasting.In the main blasting of deep hole slope cutting,a large-interval time delay hole-by-hole blasting method was adopted,and loose blasting with small explosive unit consumption,long packing,and inside-out sequential detonation were used.In order to reduce the generation of fly rock,some necessary measures were taken,such as the slope edge holes were independently designed according to the site conditions,the lateral minimum burden was obviously smaller than the slope minimum burden,and the detonation sequence and blasting parameters were flexibly adjusted according to the slope thickness.These measures greatly reduced the generation of fly rock,and effectively guaranteed the houses and factories safety in the villages below the slope.At the same time,the short-hole blasting also facilitates the addition of new working faces,which improves construction efficiency.It can provide a reference for similar projects.