Abstract:The Research Line of from-Essence-to-Phenomenon in Marx Economics Died Away before it became mature, which led the research method of modern economics not to match the research content. Investigating the reason, it is embodied on the following four aspects: the first is that the research on essence is abandoned because most economist’s knowledge become narrow increasingly; the second is that economics become abstract increasingly because of the development for pure theories; the third is that this research line is degenerated because Marxian concrete standpoint is comprehended and developed blindly; the forth is social attention dies away since the research object of economics is transferred from public field to private field.