DDA method was used to simulate the demolition blasting of dock cofferdam .Blasting characteristics and rules in 4 different states , including inclined holes low water level , inclined holes high water level , vertical holes combined with inclined holes low water level and vertical holes combined with inclined holes high water level , were analyzed .The results show that in the demolition blasting process of 1# and 2# dock cofferdam of a company , the water level has little effect on the charge of slant holes , but has significant effect on the combination of vertical holes and inclined holes .Vertical holes combined with inclined holes form a gentler slope in high water level , and a lower rock pile in low water level .Both of them may result water pour into dock instantly .Under the comprehensive analysis , it shows that the charge of inclined holes will get better blasting results .%利用DDA方法对船坞围堰的拆除爆破进行数值模拟，分析倾斜孔低水位、倾斜孔高水位、垂直孔和倾斜孔结合低水位以及垂直孔和倾斜孔结合高水位4种不同方案下的爆破特性和规律。研究结果表明：在某公司1＃、2＃船坞围堰的拆除爆破过程中，水位高低对倾斜孔装药影响不大，对垂直孔和倾斜孔结合装药有明显影响；垂直孔和倾斜孔结合装药高水位工况下形成的边坡较缓，低水位工况下形成的爆堆较低，容易产生水突然涌入坞门的现象；综合分析，选择倾斜孔装药爆破会得到更好的爆破效果。
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