In this paper the tidal phenomena are concisely specified, including the solid tides, ocean tides and atmospheric tides due to the luni-solar tide-generating force, and the Earth pole tide due to the motion of the Earth's rotation axis (polar motion); as well as their effects on the Earth rotation. The outcomes of scientific researches of Chinese astronomers on this scope are emphatically expounded. These researches deal with the mechanisms of the effects of tides on the Earth rotation, namely relations between the effects of tides and the Earth rotation, involving construction of theoretical models of these relations, analysis of the influence of tides upon the Earth rotation, computation of the secular deceleration of the Earth rotation with abundant astronomical records of ancient China, calculation of Love numbers of an elastic or anelastic Earth, effects of tides and nutation series calculated on the basis of a certain Earth model etc.; the researches deal also with the tidal effects on the results of measurements of the Earth rotation parameters with various techniques and their corrections, as well as with the optimization of observational methods and the improvement of data processing method related to the tides. Finally, the effects of tides discovered by Chinese researchers on the measurements of the period and period rate of pulsars are briefed, though very small in their magnitude but not negligible.