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Based on the triangular lattice two-dimensional photonic crystal(PC),the lattice spacing along the transverse direction to propagation is altered,and a gradient PC(GPC)flat lens is designed.The band structures and equal frequency curves of the GPC are calculated;then,the imaging mechanism and feasibility are analyzed.The imaging characteristics of the GPC flat lens are investigated.It is observed that the GPC can achieve multiple types of super-resolution imaging for the point source.This GPC lens is allowed to be applied to imaging and other fields such as filtering and sensing.