Piezoelectric effects and electronic structures of InAs/GaAs quantum dots grown along (111) and (011) directions are investigated in this paper.The finite element method is used.Electronic energy levels are calculated by solving the three-dimensional effective mass Schrdinger equation including a strain modified confinement potential and piezoelectric effects.The difference in electronic structure between quantum dots grown along the (111) direction and the (011) direction are compared.The cubic and truncated pyramidal shaped quantum dots are adopted. Piezoelectric effects and electronic structures of InAs / GaAs quantum dots grown along (111) and (011) directions are investigated in this paper. The finite element method is used. Electronic energy levels are calculated by solving the three-dimensional effective mass Schrödinger equation including a strain modified confinement potential and piezoelectric effects. difference in electronic structure between quantum dots grown along the (111) direction and the (011) direction are compared. cubic and truncated pyramidal shaped quantum dots are adopted.