A statistical analysis on the Wenchuan aftershock activity triggered by tidal forces is systematically studied based on Schusters test，including earthquakes triggered by tidal force，tidal stress and tidal coulomb failure stress． The results show that a group of strong aftershocks which occurred at the end of July to early August in 2008 at the north of Wenchuan were obviously triggered by earth tide，the same conclusion is drawn by Schusters smooth test of the tidal force，tidal stress and tidal coulomb failure stress． In addition，the Wenchuan aftershock activity is obviously triggered by fortnight tide． In the north，the aftershocks happened more frequently in the first and last quarters of the moon，and in the south，the aftershocks happened more frequently in the first and last quarters of the moon and during the full moon．

基于Schuster检验对汶川地震余震受固体潮的调制触发情况进行了系统的研究，包括对引潮力、潮汐应力和潮汐库仑破裂应力等触发地震情况的分时段分区段研究。结果表明，汶川北段2008年7月底至8月初的一组强余震受潮汐触发明显，引潮力、潮汐正应力及潮汐库仑破裂应力经Schuster检验平滑后均得到基本一致的结果。此外，汶川余震受半月潮的调制非常明显，北段余震多发生于上、下弦时段，南段地震多发生于上、下弦和望时段。