The paper takes bladed disks with geometric mistuning as the object of the research, the expression of reduced order model was derived from the dynamic equation, based on the modeling method with sectors. The modal analysis and force response analysis of bladed disks with geometric mistuning were finished by using the reduced order method. In this paper validated the method using an academic bladed disks finite element model by comparing the natural frequencies and the force response. The result shows that the data of the two methods was fully meet, which proves the correctness of the reduced order method.