Ditching　blasting　differs　from　common　bench　blasting,　but　it　has　its　specialty　and　complexity.　While　in　the　course　of　blasting　design　and　construction,　the　rock　geology　characteristic　and　the　environment　should　be　sufficiently　realized,　and　the　scheme　of　blasting　and　valid　protection　measure　should　be　established.　According　to　the　characteristic　of　Zhangfang　emergency　water　engineering　of　Beijing,　this　paper　introduces　the　principle　of　ditching　blasting　and　the　scheme　of　blasting　construction.　Relative　technique　measures　of　ditching　controlling　blasting　are　put　forward,　such　as　the　pattern　of　hole　disposal,　structure　of　stage　charge,　techniques　of　millisecond　blasting,　measures　of　reducing　vibration　and　controlling　blasting　flying　rock.　The　methods　above　are　used　in　practice　engineering　and　ideal　achievement　is　obtained.