Basing on synthetical analysis for a lot of geological structures,observation of ground-stress and ground distortion,and explanations of focal mechanism,the author considers that forced form and forced direction of land mass are changed in both geological age and recent time.Without obstruction and influence of other factors,in the northern hemisphere,at least in middle-low latitudes area,in a single tectonic movement,the direction of compressive stress is changing according to the law SN→NE→NW→EW,it is synchronised with changing of uniform,acceleration and deceleration of speed of Earth's rotation.Since Jurassic period,due to rapid deceleration of Earth's rotation,EW-direction compressive stress is getting stronger.By all above reasons,the conclusion is that the cause,making change of forced direction of land mass,may be related with the change of Earth's rotation rate.