Taking some project as the example,the paper introduces the smooth blasting mechanism of the deep hole preserved protective layer in the cutting slope blasting construction of the high slope granite,researches the blasting order,parameter calculation,hole arrangement,fill-ing,and firing network design,so as to achieve the smooth slope and stable slope and 85% of half hole rate after the blasting.%以具体工程为例，介绍了在高边坡花岗岩岩质路堑边坡爆破施工中采用的预留保护层深孔光面爆破机理，对爆破顺序、参数计算、布孔、装药、起爆网络设计等进行了研究，通过实践，达到了爆后坡面平整、边坡稳定、半孔率为85%的效果。
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