Аннотация:All cerebral aneurysms have the potential to rupture and cause bleeding within the brain. To understand the tactics of treatment of patients with intracranial aneurysms, it is necessary to study in detail the pressure and flow within the aneurysm and vessels. Numerical modelling is a powerful tool for blood flow study, prediction and visualisation. In this paper the method that uses patient-oriented physiological model to determine the numerical modelling parameters is proposed. The experiments were carried out on the real geometry of the patient with two aneurisms of the middle cerebral artery and showed that the proposed methods improves the quality of the surgical planning.