The experimental results of high order harmonic generation in Ar noble gases using an 45 fs, 785 nm Ti:sapphire laser pulse are presented. The effects of gas densities and pulse intensities on harmonic emission are studied, The harmonic generation up to order 81 (9.7 nm) under optimum experimental condition is observed, which is to date the shortest wavelength hormonic emission in Ar noble gases. Analyses show that the harmonics higher than order 57 are generated from Ar +.