Rotors in general have complex geometries which make analytical modeling of the rotor to determine its dynamic behavior difficult. For this purpose, strong approaches such as finite element method are used to analyze the system. Finite element method saves time and money by allowing reductions in equations while solving the equation systems. Besides, it is possible to obtain faster solutions by using software that can solve these equations. Investigating the Campbell diagrams and deformations caused by critical speeds is very important in investigation of the dynamic behaviors of rotors. For this reason, obtaining the Campbell diagrams of the rotating systems and determining the critical speeds are very useful for us to observe the system behaviors. There are several programs based on finite element method to obtain these data and diagrams. In this study, a program named Dynrot was used to make dynamic analysis and the evaluation of the results and how the software was used are presented in the study. For this purpose, a gas turbine rotor with certain geometrical and mechanical properties is modeled and its dynamic analysis was made by Dynrot program. © 2012 Elsevier Ltd. All rights reserved.