Tectonic dynamics is very important to the analysis of regional tectono-sedimentary evolution, volcanicmagmatic action and metallogenic regularity. Although a lot of research have proved that the tectonic dynamics had changed many times since the development of the Pacific plate, the varied mechanics  needs  to be explored deeply. In this paper, based on the collecting and sorting of the isotopic age and paleomagnetic data published recently, the drift trajectories and velocities of the Pacific plate, India plate and Philippines Sea plate since its distributions near the eastern China, are analyzed firstly. And then, according to the kinematics characteristics of these three main plates, as well as the regional tectonic deformation features, since the formation of the Pacific plate, the tectonics dynamics background of  eastern China can be divided into three stages: The Middle JurassicEarly Cretaceous ((175~170)~(145±5) Ma, (145±5)~125 Ma and (125~95) Ma BP), the late Cretaceous-Paleogene (95~80 Ma, 80~43 Ma and 43~23 Ma BP) and the Neogene-Quaternary 23~10 Ma BP and 10 Ma BP to present). It is pointed out in the paper that the tectonic dynamics mechanics of eastern China in the Middle Jurassic-Early Cretaceous are compressshearing,  changed to stretching and extension in the late CretaceousPaleogene, and then turned to compression in the Neogene-Quaternary is point out, and the specific changes in these three tectonic dynamic stages are discussed in detail at last.