Abstract: A Hartmann wavefront sensor is applied to measuring the aero-optical aberrated wavefronts when the collimated light beam passes through a low speed heated turbulent jet. Proper orthogonal decomposition(POD) technique is applied to the aberraed wavefront time series then the eigenfunctions and the time coefficients are obtained. Interpolations of the eigenfunctions are made on those positions where no detectors are set. The predicted wavefronts can be represented as a product of the interpolated eigenfunction and a time coefficient. Comparisons are made in time domain and frequency domain between the predicted wavefronts and the measured wavefronts, which indicate using the interpolation method to predict the wavefront is effective. It is proved that this method has less amount of computat