The phase-matching of high-order harmonic generated in rare gases confined in a hollow fiber wave-guide is studied theoretically. A cutoff intensity for a certain phase-matched harmonic is found in calculations. The calculations show that a ultrashort-pulse laser and the medium with higher ionization potential is necessary for generating higher-order phase-matched harmonic. The possibility of selective generation of a certain order or several orders of harmonics in the hollow fiber wave-guide is discussed, and some measures of improving the possibility of selectivity for a certain order or several orders of harmonics are advised.