This paper presents some new results concerning the mechanism, characteristics and feasibility for the suggested by the authors direct method of image formation in some positive resists directly during exposure by the electron beam in a vacuum (dry method of electron-beam etching resist - method DEBER). For PMMA resist as an example it has been shown in particular that the method DEBER very convenient for obtaining a relief micro and nanostructures with a rounded profile cross-section (including spherical, aspheric, sinusoidal etc.) in the PMMA resist. The examples presented of process conditions influence on the form of obtained relief structures. The examples are given to obtain spatial 3Dstructures with good accuracy by Z-axis and with good surface roughness. In general, according to the authors, the data presented indicate significant opportunities for applying the method DEBER, in particular for the manufacture of the optoelectronics elements (diffraction gratings, microlenses, focusers, optical waveguides, anti-reflective coatings, and others.).