New trends appeared in product design and technological planning, which contributed in the development of new finish machining procedures like diamond burnishing. With the influence of diamond burnishing process, the surface roughness, the hardness of machined surface, and the dimensional accuracy can be improved. In this paper the effect of burnishing technological parameters on the cylindricity error of the burnished cylindrical surface and furthermore on changing of hardness of the burnished surfaces were examined, too. Burnishing parameters, which were taken into consideration during the examinations, are burnishing speed, burnishing feed, and burnishing force. Formulas suitable for determination of the improvement ratios of cylindrical shape error and improvement of hardness were determined by the Taguchi type Factorial Experimental Design.