  Stress or strain analysis for each atom around structural defects in a
crystal is difficult. We propose a new analytical approach based on the eminent
Embedding Atom Method(EAM) potential. We observe that the ratio $R$ between the
repulsive and binding terms of the EAM is a definite measure for calculating
the strain field of a single atom subject to an irregular coordination number.
The determination of adequate potential parameters and their application to the
calculation of the properties of surface, vacancy, and boundary of pure Al are
shown.
