Abstract: At present, the application of optical measurement technique makes the measurement data increase tens of times. This can create the difficulty of reconstruction of CAD model. A new adoptive sampling method based on surface variation is proposed in order to reduce mass data acquired by fringe projection measurement.And the computation method of precision sampling is given. Depending on the surface variation,the adaptive sampling point cloud of object is acquired; the CAD model is reconstructed by the sampling point cloud. The sampling precision and the fitting precision reach 2.3μm and 7.2μm respectively.