Abstract: Heidegger thought about the fators which dominate modern science-s essence. His thought cover three points. First, science have technological essence and it is technology-s typical function and form. Second, metaphysics-s representative thought mode is modern science-s basis. Third, Being itself is the thing pervading in science-s essence. Heidegger thought this for returning the foudatation and starting the new, in other words, for returning the primary Being and reaching the Being itself.