Abstract: Based on the research results of the past, using the integrated geological,geophysical, geochemical etc. data at hand, and combining recent research results of lithosphere evolution of Eastern China, this paper is concentrated on the mechanics character, evolution phases and dynamics background of TanchengLujiang fault zone, and on the influence of the deep lithosphere activity on the TanchengLujiang fault zone and on the formation of Bohai bay basin by bringing up some different cognition from the past studies. For example, the TanchengLujiang fault zone may be a transform fault zone in south section during Late Paleozoic, and the formation of Bohai bay basin was not related to the TanchengLujiang fault zone. Finally three questions are raised to be discussed.

Key words: TanchengLujiang fault zone, evolution phase, dynamics background