The excavation of damping groove is an effective measure to reduce the blasting seismic effect. The determination of reasonable size can not only cost less, but hasten the construction progress. Through a numerical simulation on Taiyuan Xi Shan slope blasting excavation, the reasonable design of damping ditch size was studied. Results show that, for the slope, a single row of holes construction, reasonable length of damping ditch should be close to 2. 5 times the length of the holes coverage area and the reasonable depth shoulb be deeper than the hole base. Damping ratio has a close relationship to length and depth, but which wont increase unlimitedly with increasing size. When its size reaches to a certain value, the dampingvrate will tend to keep constant.%开挖减震沟是降低爆破地震效应的有效措施,而其合理尺寸的确定不仅能够节约成本,而且也能加快施工进度.通过数值模拟对太原西山某边坡台阶爆破开挖时,减震沟的合理尺寸的确定进行了研究并指导实际施工,结果表明:对于该边坡,单排炮孔作用时,减震沟的合理长度约为炮孔覆盖区域长度的2.5倍,而其合理深度超过炮孔深度或者更深；减震沟的减震率与其长度和深度有很大关系,但减震率并不是随着长度和深度的增加而无限增加,当其达到某一值时,减震率趋于恒定.
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