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We have investigated the spin relaxation process of electron at room temperature in nominally undoped GaAs/AlGaAs multiple‐quantum wells. The spin relaxation times are measured for different well thicknesses using time‐resolved polarization absorption measurement. The spin relaxation time τ_s, is found to depend on the electron confined energy E_1e, according to τ_s∝E_1e^−2.2, showing that the main spin relaxation mechanism at room temperature is the D’yakonov–Perel’ interaction.