The classification between rectangular and ellipsoid/circular areas was studied,and the method and steps was listed in detail.There were rectangular and ellipsoid/circular areas which had different areas and different obliquities in bio-value image.The rectangular areas and ellipsoid/circular areas targets could be classified by the parameters such as area,perimeter length and bounding box.And some important parameters such as the center position,length(major axis),width(minor axis),perimeter length,area,and the obliquity of the minor inertia axis were also given.The new method proposed in this paper was obvious and have rotation invariability and translation invariability.