Abstract: This paper is focused on “projection” of projective transformation matrix. First, a comment is made to the fact of the ignorance of the third dimension coordinate, in the most books presently published. The author assorts in the paper that information integrality of homogenous projective transformation matrix should be maintained. Secondly, the author indicates the errors in the “projective” figures in those books, and analyzes the reasons, with right formats proposed. Finally, a method for generating unified homogenous transformation matrix is provided, which allows to generate any axonometric drawings with original object's depth direction reserved.