Disclosed herein is modeling method which is enabled to analyses neurons in order to reduce real neurons physiologically properly using the relationship between asymmetry in signal propagation between a soma and dendrites and dendritic excitability. The modeling method for neurons include determining voltage attenuation factors which represent properties of signal propagation between dendrites and a soma and is represented as functions of distance from the soma; and determining a plurality of passive parameter at a pre-determined path length using system parameters defined from the anatomical model comprising the voltage attenuation factors at the pre-determined path length.