针对密山地震台观测数据一直存在的类似尖脉冲干扰的问题，通过对三次对比测试以及工频干扰测试获取的数据资料进行分析、研究，确定了干扰存在的客观性，初步确定了干扰信号的基本分布状态，排除了部分干扰源方位。

this paper, according to the sharp pulse that has been existed in Mishan seismic observation data, through three times contrast test and power frequency interference from the measured data, analyzed, research and determined the interference of objectivity existence, preliminarily determinedthe interfering signal basic distribution state,and ruled out part of the interference source orientation.