We present a simple and feasible method based on ab initio principle for studying the partly deformed quantum dot with a three-dimensional confinement potential of finite depth, which relies on the unrestricted Hartree-Fock-Roothaan equation. The results show that the electronic filling spectra can reconstruct due to the deformation effect in few electron quantum dots. This method can solve few-body problem of the deformed quantum dot and study the geometry effect on the excess electron filling spectra. (C) 2003 Elsevier B.V. All rights reserved.