Abstract: The best extracting process of gelatin from ballomfish skin was studied. To observe the effect of sodium hydroxide and vitriol and their action time to the extracting efficiency and quality.The results showed that the ballomfish skin was marinate with 8 times volume of 0.2%sodium hydroxide and 0.3%vitriol successively. Then the factors of the volume of water, the time and the temperature of extracting to the influence of the extracting rate were observed. The results showed that the best extracting technology was 4 times volume,the temperature was 60℃,and two hours one time.