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In this study, the electronic properties of a core/shell/well/shell CdSe/ZnS quantum dot heterostructure with double electron have been investigated. First, the energy eigenvalues and corresponding wave functions of this structure have been calculated as a function of the layer thicknesses for cases with and without an on-center donor impurity. For this purpose, the Poisson-Schrödinger equations have been solved self-consistently in the frame of effective mass approximation and Hartree treatment. The results have been analyzed in a detail as a function of the core radius and layer thicknesses for cases with and without the impurity and physical reasons have been discussed. We have observed that the electronic properties are drastically dependent on the layer thicknesses and these properties can change importantly with existing of the impurity atom., In this study, the electronic properties of a core/shell/well/shell CdSe/ZnS quantum dot heterostructure with double electron have been investigated. First, the energy eigenvalues and corresponding wave functions of this structure have been calculated as a function of the layer thicknesses for cases with and without an on-center donor impurity. For this purpose, the Poisson-Schrödinger equations have been solved selfconsistently in the frame of effective mass approximation and Hartree treatment. The results have been analyzed in a detail as a function of the core radius and layer thicknesses for cases with and without the impurity and physical reasons have been discussed. We have observed that the electronic properties are drastically dependent on the layer thicknesses and these properties can change importantly with existing of the impurity atom.