Abstarct: Bit part of a drilling system that has been in direct contact with the rock, the energy generated by the system is transmitted to the rock drilling and shattered rock. The aim of this thesis, choosing the right bit for drilling in the Maron petroleum field. To achieve this, the method of decision making, Fuzzy Delphi Analytic Hierarchy Process was chosen as the basis for work. Not only, there is diffrences ideaes about the options and drilling creteriaes, but also, periority of options and creteriaes relative to each other is not absolute and does not follow the binary rules. That's why the Fuzzy Delphi Analytic Hierarchy Process (FDAHP), method is selected. The parameters used in this study include: uniaxial compressive strength, abrasive minerals, grain size and texture, depth laxyer drilling, water, fault, the tension, elasticity, porosity and permeability of the rock, adhesion rock, hard rock and the opening and filling joints. Options include the two main groups of Roller Cone Bit and Polycrystalline Diamond Compact (PDC) drill bit with a subset of this is. To solve this problem the importance of drilling parameters relative to each other to come to this area to help engineers to critical parameters in Maron petroleum field drilling process known and in respect of which do a more complete studies. In the next step, the scores of each bit toward each parameter obtained. at the final step overall priority of all options and ranking options obtained.