The plane wave expansion method was used to explore the photonic band-gap characteristics of two kinds of photonic crystal structure under rotation operation. Two different kinds of photonic crystal structure were constructed and the band-gap characteristics of these two kinds of structure were compared. The effect of the rotation operation on the band gap of two kinds of structure in TE mode respectively was discussed. It’s found that the distribution of medium column in x-z plane together influence TE mode band gaps. According to the result of calculation, the reason of the influence on the band gap characteristics was analyzed, and the angle range of the optimum band gap was given. It has better theoretical guiding significance on producing photonic crystal of good performance.