For the purpose of realizing the large-mode-area fibers with low nor mal dispersion,a novel coaxial-dual-core fiber is proposed.By introducing an air hole in the enter c ore,the fiber can process a red-shifted zero dispersion wavelength as well as an increased effective mode area.The influence of fiber parameters on the group velocity dispersion and effective mode area is fur ther explored.As a result,the designed fibers with three different choices of parameter conditions can operate in the broadband normal-dispersion wavelength regions,which cover 1 400—1 800 nm,1 700—2 000 nm and 2 000—2 300 nm,re-spectively.The gro up velocity dispersion prof iles exhibit low and flat shapes with values more than －5 ps/(nm·km),while the effective mode areas can reach up to 296 μ m².The proposed coaxial-dual-core fiber has potential applications in high-power ultrashort- pulse fiber laser sources.