In this paper, the numeral response and main parameters of experimental population life table were analyzed for determining the suppressing ability of Amblyseius cucumeris on Panonychus citri. The result showed that: (1) Under 21-31°C and 1 - 9 prey densities/leaf fragment condition, the prey consumptions of A. cucumeris increased with the temperature or prey density; (2) In 1:3 predator-prey ratio treatment, the suppression of P. citri (Ro=34.0053; T=19.4369; t=3.8204) was rather weak, it was enhanced as the ratio over 5:30, and the populations of P. citri in these treatments can be fully controlled within 4-5 days; (3) Under 25±1°C, 80-85% RH and 15L: 9D illumination conditions, the net reproductive rate, mean generation duration and the time for population double increase of P. citri (Ro=34.0053; T=19.4369; t=3.8204) were higher than those of A. cucumeris (Ro=21.8750; T=16.8943; t=3.7954). While the intrinsic rate of increase and finite rate of increase of the former (rm=0.1814; λ=1.1989) were lower than those of the latter (rm=0.1826; λ=1.2004). These results indicated that A. cucumeris is a desirable bio-control agent to suppress P. citri at lower population stage in citrus orchard. In this paper, the numeral response and main parameters of experimental population life table were analyzed for determining the suppressed ability of Amblyseius cucumeris on Panonychus citri. The result showed that: (1) Under 21-31 ° C and 1 - 9 prey densities / (2) In 1: 3 predator-prey ratio treatment, the suppression of P. citri (Ro = 34.0053; T = 19.4369; t = 3.8204 ) was rather weak, it was enhanced as the ratio over 5:30, and the populations of P. citri in these treatments can be fully controlled within 4-5 days; (3) Under 25 ± 1 ° C, 80-85% RH and 15L: 9D illumination conditions, the net reproductive rate, mean generation duration and the time for population double increase of P. citri (Ro = 34.0053; T = 19.4369; t = 3.8204) were higher than those of A. cucumeris (Ro = 21.8750; T = 16.8943; t = 3.7954). While the intrinsic rate of increase and finite rate of increase of the former (rm = 0.1814; λ = 1.1989) were lower than those of the latter (rm = 0.1826; λ = 1.2004). These results indicates that A. cucumeris is a desirable bio-control agent to suppress P. citri at lower population stage in citrus orchard.