High quality z-cut LiNbO3,nonlinear photonic crystals with two-dimensional dodecagonal and fractal superlattices have been successfully fabricated by applying the high voltage pulses.By collinear quasi-phase matching technique,second-harmonics at five wavelengths and ten wavelengths are observed simultaneously in one poled crystal respectively.The same results can be obtained by rotating around z-axis by integrals of 300 in quasi-periodically poled crystal.In fractal nonlinear photonic crystal,the normalized conversion efficiency can be as high as 0.53％/mW for 499 nm second-harmonic laser spot.