Phase-matched high-order harmonic generation in Ar gas-filled cell was investigated experimentally. The phase-matched 27th order harmonic driven by a commercially available solid-state femtosecond laser system at 0.55 mJ/pulse energy level and 1 kHz repetition rate was obtained. Spectral blueshift and broadening of high-order harmonics were analyzed. Moreover, the source size of high-order harmonic generation was enhanced under the phase-matching condition.