利用大连地震台地磁Z分量观测资料，对其日变幅度、低点时间和日变形态的年变化进行分析，由此初步总结地磁Z分量日变化的规律及特征，对识别地磁场异常变化或干扰变化具有一定参考意义。

In this paper, using geomagnetic Zcomponent data in Dalian Seismic Station, we analyzed the amplitude, lowpoint time and daily shape annual variation. We can summarize some basic characteristics of changes in the geomagnetic Zcomponent. The results presented in this paper have certain value for reference to recognition interference and abnormal of the geomagnetic field.