Semen were collected from 20 Korean bulls raised in Kyunggi Province with artificial vagina and quality, preservability in liquid state with and without glycerol and freezability were investigated. The results obtained in this study were summarized as follows: 1. Volume of semen, initial sperm motility index, number of sperm per ㎖ of semen, abnormality, pH and mounting times till ejaculation was 4.4㎖, 83.7, 10.3×10^8, 13.6%, 6.4 and 2.2, respectively. 2. In the case of liquid semen stored at 5℃ for 7 days, sperm motility index of diluted semen with glycerol was higher than that of diluted semen without glycerol. 3. Freeze-thawed semen which was stored at 5℃ for 6 days decreased slightly its sperm motility index during 1 and 2 days, but rapidly thereafter. 4. Forty-five percentage of the bull ejaculated showed more than 41 sperm motility index after freeze-thawing.