The paper expounds the working principles of optical fiber image transmitting bundle by acid-leaching technology according to research on the quality of glass and its making technology,.It also analyzes some factors that lead to dark fibers due to the quality of glass and geometric defects of glass tube, and raises some relevant improving measures, which takes great effects in reducing the rate of dark fibers. Besides, the paper renders some useful parameters of optical fiber image transmitting bundle by acid-leaching technology.