The results obtained using the group model of earthquakes generated in tectonic blocks are further used in this paper to analyze the relationship between the M S≥7.0 events in Chinese mainland and the modulation and triggering from the earth tides. The research shows that the M S 7.0 events in Chinese mainland have been significantly triggered by the tidal stress, especially within the active period with group strong earthquakes. In the quiescence period of strong earthquakes, no M S7.0 events were triggered, while within the active period, over 82.4% of strong earthquakes took place within a special moon phase, which is 36.4% higher than the average. Therefore, the modulation and triggering of tidal stress can be used to distinguish the active periods and to forecast the time of the strong earthquakes within the active period. The relationship between the tidal triggering and the tectonic dynamic condition is investigated and the mechanism of the modulation is simulated with the group model of earthquakes generated in tectonic blocks. The results obtained using the group model of earthquakes generated in tectonic blocks are further used in this paper to analyze the relationship between the MS ≥ 7.0 events in Chinese mainland and the modulation and triggering from the earth tides. The research shows that the MS 7.0 events in Chinese mainland have been significantly triggered by the tidal stress, especially within the active period with group strong earthquakes. no M S7.0 events were triggered, while within the active period, over 82.4% of strong earthquakes took place within a special moon phase, which is 36.4% higher than the average. which, the modulation and triggering of tidal stress can be used to distinguish the active earth and the forecast the time of the strong earthquakes within the active period. relationship between the tidal triggering and the tectonic dynamic condition is investigated and the mechanism of the modulation is simulated with the group model of earthquakes generated in tectonic blocks.