The purpose of this paper is to investigate the effects of different food and food densities on the population dynamics of Fabrea salina. Commercial yeast and Dunaliella salina were provided to the F. salina. The F. salina fed by D. salina had the higher growth rate (0.78 ± 0.019 / d), and lower generation time (0.89 ± 0.021 d). Its intrinsic growth rate is 1.49/d, and the Michaelis constant was 1 121.32. However, the growth rate of F. salina fed by commercial yeast was lower (0.36 ± 0.001 / d), and the generation time was longer (1.93 ± 0.007 d); its intrinsic growth rate was 0.51/d and the Michaelis constant was 2.68. One-way ANOVA test results showed that the kind of food and food density had a significant effect on the population growth of F. salina (P < 0.01). Feeding F. salina by D. salina with a density of 10 × 109 cells/L can achieve high-density culture in a short period of time. While, yeast is suitable to feed F. salina to keep them in the laboratory for longer time.