Starting point of this theses are unfinished photopolymer CtP printing forms for flexo printing. Photopolymer printing forms are pre-layered with LAMS (Laser Ablation Mask) layer which has the role of a mask in the process of exposure. Upon pre-exposure, LAMS layer is removed by laser ablation only at the points where photopolymer printing form needs to be exposed. The motif generated by laser ablation is the control target containing fields of differing halftone values. Using the laser ablation of the LAMS layer, the liniature of the printing form, which is crucial for the experimental faze, is also defined. Remaining steps to develop the photopolymer printing forms are implemented according to standard conditions. In this thesis, the printing forms upon which the measuring is undertaken are brought to correlation with the opened surface of the LAMS layer for specific halftone value as well as with the shape of the printing element itself. The theoretic part of this thesis offers a detailed explanation of the procedure of development of the photopolymer printing forms for flexo printing as well as the characteristics of the materials needed for this procedure. Theoretical background for the experimental part is also explained and this completes the notion of the whole procedure as well as the goal of the research conducted in this theses. Research has brought forth the conclusion that using higher degrees of bump up curves in development of printing forms for flexo printing, the printing elements on the lower halftone values are formed more regularly.