研究山东内陆地区2008年以来1级以上小震的月相调制效应，并结合地震b值变化进行分析。结果表明，2020-02-18长清M4.1地震前该区存在低b值、高调制比异常，计算综合节面解P轴方位偏转发现，其与小震b值的低值变化时段非常一致。研究区6次4 级以上地震前，有4次出现异常，调制比≥0.33；而2011年和2016年2次范县地震前未出现异常，可能与范县小震集中区受采油作用影响有关。

We study the moon phase modulation effect of small earthquakes above M1 in Shandong inland area since 2008, combining with the variation of seismic b value in this area. The results show that there are anomalies of low b value and high modulation ratio in the area before the 2020-02-18 Changqing M4.1 earthquake, and we calculate the deflection phenomenon of P-axis of the composite nodal plane solution, which is very consistent with the variation period of low b value of small earthquakes. In addition, before the 6 earthquakes above M4 in this area, the abnormality of modulation ratio ≥0.33 occurs 4 times. In 2011 and 2016, the two Fanxian earthquakes did not show the above changes, which may be related to the activity mechanism of oil recovery in Fanxian small earthquake concentration area.