Tea relatiohehips between wavelike phenomena in the earth's interior,tectonic structure and earthquakes are dicussed. FOur types of generalized tectonic waves are introduced. They are: the ultra-long-period tectonic weves which are synthetical tectonic results in different earth history;the long-period (from several year. to tens of years of different kinds and velocities) tectonic waves reflected by migrtions of earthquake activity,so-called seismicity waves;the medium -period (from several months to several years) tectonic waves reflected by three threestage development process of earthquake Precurors; and the short-period (from sereral minutes to seseral days)tectonic waves recorded by changes in ground water level.tilt,gravity,seismic waves,electromagnetic radistiou,earth sound,and the others. Seismicity waves of three types are interpeted as generalized Rayleigh tectonic weves,generalized Love tectonic waves and generalized channel tectonic waves. Finally,the applications of wavelike phenomena of the earth's interior to earthquake research is discussed, including seismic risk analysis and seismic zoning,earthquake prediction and seismogenesis researches.