In order to simplify the super-resolution imaging system,a phase mask is proposed and introduced into the object and reference beams part of the digital holographic recording system,respectively,to produce the on-axis and off-axis illumination beams and the sub-reference beams with different carrier frequency.The diffraction fields containing the low and high frequency information can be recorded by the CCD sensor whose position is fixed during the recording process with different illumination beams produced by phase mask.The low and high frequency information can be separated by reference beams with different carrier frequency in the spectrum plane of the composite hologram.After the frequency filtering followed by an inverse Fourier transform,the low and high frequency information can be obtained,and the object wavefront containing the low and high frequency information at the object plane can be obtained by calculating the Fresnel diffraction and removing the additional phases introduced by the object illuminations.The reconstructed image can be obtained by synthesizing the wavefront containing low and high frequency information of the recorded object.It can be known form the experiment that the resolution of the synthesized image is over that determined by the numerical aperture of the recording system.