Photonic crystals are novel artificial microstructures which are fabricated analogously to the arrangement of atoms in solid crystals.Laser holography method is an important method to fabricate photonic crystals where polarization combination of light beams plays a key role.Starting with the multi-beam interference principle,rhombic lattice is taken as an example to discuss its design principle and beam configuration.Moreover,combing with computer simulations,the influence of the combination of different types of polarizations is systematically studied,such as linear,circular and elliptical polarizations,on the "atom" of photonic crystal microstructures.It is found that different polarization combinations and intensity ratio of light beams sensitively affect the shape,direction,as well as the positions of the "atom".What is more,laser holography experiments are designed and carried out to verify the theoretical predictions and simulations.Real-time monitoring by computer is employed to facilitate the adjustment of polarizations and intensity ratio of light beams.Various photonic crystal microstructures are obtained under different conditions of polarization combinations and intensity ratios.The experimental results agree well with the theoretical predictions and simulations.The results are not only beneficial for improving the design efficiency of photonic crystals with specific shape of "atom",but also can effectively reduce the control blindness of polarizations and enhance the experimental efficiency accordingly.