The phase anomaly zones are investigated on the basis of the integral theorem of Helmholtz and Kirchhoff in terms of the Kirchhoff′s boundary conditions and the physical meaning of the integral for the diverging and converging spherical waves. For the diverging spherical wave, the phase anomaly zone exists in the source space, the phase variations is different in the different parts of the zone, and the point source is a special point of the zone. On the other hand, the phase anomaly zone is in the image space, the phase variation is consistent in all the zones, and the focus is a special point of the phase anomaly zone for the converging spherical wave.