To enlarge the field-of-view of digital holographic surface measurement, so that digital holography can be applied in three-dimensional(3-D) surface measurement of large objects,based on Fresnel off axis digital holography, different part of the object is illuminated singly and their holograms are recorded respectively. The object-reference angle remains the same for each recording by precisely controlling the incident angle of the reference wave using an electronically controlled turntable. The position of the illuminated part can be obtained from the change of the incident angle of reference wave. The unwrapped phase maps are spliced to obtain the 3-D surface shape of the whole object. The 3-D surface shape of a 11 cm×19 cm plaster mouth model is measured using this method. The absolute splicing error is no more than 1.14 mm and the surface height error is about 0.5 mm. It is proved that this method is very effective in enlarging the field-of-view of digital holographic 3-D surface shape measurement and its splicing precision is as high as the lateral resolution of digital holography.