A series of polynomials orthogonalized in an annulus sector domain is derived from Zernike polynomials by using Gram-Schmidt orthogonalizing method. The same terms of the two polynomials are found to have similar distributions and physical meanings in their respective orthogonal domains. An aberrated wavefront on an annulus sector domain is expanded with Zernike polynomials, annular Zernike polynomials, circumcircle Zernike polynomials and annulus sector Zernike polynomials respectively. The 4 sets of coeff...