All solid silver halide photonic crystal fibers(PCFs) are designed,which are composed of two silver halide crystalline materials.The core consists of pure AgBr and the cladding includes AgCl fiber optic elements arranged in hexagonal rings around the core.The influence of structure parameters such as the number of the cladding layer,the lattice constant and the duty cycle on the transmission characteristics such as the loss and dispersion properties of PCFs is analyzed with the full vector finite element method(FEM).When the number of the cladding layer is 6,the duty cycle is 0.455 and the lattice constant is 110 μm,the leakage loss of the PCFs is only 0.0195 dB/km at 10.6 μm,and fiber dispersion uctuates between 0.3 ps/(nm·km) and 0.7 ps/(nm·km) in the 4-14.5 μm middle infrared band.A very good near zero ultra flattened dispersion and low loss characteristics are demonstrated.