There are noticeable demodulation phase errors for spectrum expanding when the traditional Fourier transform method is used to evaluate the carrier-wave interfergram fringe pattern including multi-protuberances. A new method to modulate carrier-wave speckle pattern fringe based on finge center was proposed. According to the parallel modulation method and gradient modulation method, the corresponding mathematical reasoning of fringe center modulation method was carried out in theory respectively. Then least-square cubic surface fitting algorithm was adopted to evaluate the whole out-of-plane displacement of object surface. Experimental results show that the above-mentioned modulation method and surface fitting method could not only modulate complex carrier-wave fringe pattern, but also obtain alabastrine whole out-of-plane displacement information with sub-pixel location precision and continuum.