With the effective-mass approximation and the method of diagonalization of the Hamiltonian

the eigenvalue of energy and the eigen-wave-function of quantum dots (8 polarized electrons) have been calculated in the harmonic oscillator potential

and the clear electronic structures have been gained by the methods of one-body

two-body and three-body density functions. The electronic structures’ change is analyzed when the quantum dot is doped (adding one positive or negative electron). The results show that positive doping increases the aggregation of the central charge of the quantum dots

while the negative dopant forms the charge void at the center.