The authors put forward that the occurrence of some great earthquakes (M≥8) in the region is related to the lunar tide-generating force effect of the greatest declination of the Moon.

Relationship between the variation of lunisolar tidal force and earthquakes in Taiwan;

From studying the relationship between the variation of lunisolar tidal force and the activity of the earthquakes ( M s>5 5) in North China since 1900, occurrence times of these earthquakes have obvious correlation with the variation of the lunisolar tidal force in seismic region, and the lunisolar tidal force plays an important part in triggering earthquakes.

The effects of tidal force on the orbit planes of the Moon and satellites;

The numerical calculation demonstrates that the thermal expansion from integrated inner geotherm is the force source of deep fault and the tide-generating force is the force soure of lithosphere movement of large scale integrated by repeated creep.

The origin of tide-generating force and the relative rate of the tide-generating forces from the sun and the moon are discussed.

Theoretical deduction shows that precession-nutation moment induced by odd order tidal generating potential causes out of phases of longitude and obliquity nutation(namely, there are cos term in longitu.