a method and equipment based on multi - core fiber bragg grating probe for measuring structures of a micro part are provided . the provided method relates to how to accomplish measuring structures of a micro part by transforming two or three - dimensional contact displacements into spectrum shifts of the multi - core fbg probe , and to reconstruct the structure geometry of a micro part . the provided equipment can be used to bring the spherical tip of the multi - core fbg probe into contact with a micro part , to determine coordinates of contact points , and to reconstruct the structure geometry of a micro part . the provided method and equipment feature high sensitivity , low probing force , high inspecting aspect ratio and immunity to environment interference .