In this paper, the experimental results of high-order harmonic generation in Kr using an 105 fs, 795 nm laser system are presented. The effects of gas densities, laser intensity and laser polarization on harmonic emission are mainly studied. At the same time, the results are analysed from theory. The results indicate that proper gas densities and laser intensity are needed in order to get stronger harmonic emission; besides having higher laser intensity, the detector of high sensitivity must be possessed in order to get higher order harmonic generation.