Infrared hollow fibers were developed for spectroscopic gas sensing. The hollow core fiber has a silver film and a dielectric film on its inner surface to enhance the reflection rate, and thus to low the transmission loss. The chemical silver mirror-reaction method and the liquid-phase coating technique were used to form the silver and the dielectric film. Low-loss properties were achieved from the visible to the mid-infrared wavelength regions by optimizing the dielectric material and the film thickness. The low-loss hollow core fiber can be used not only as the absorption cell for gas sensing but also as the transmission medium for infrared light. Primary experimental results show that the hollow fiber is a good alternative for gas cell for miniaturization in spectroscopic gas sensing.