In order to understand the growth characteristics of juvenile Thamnaconus septentrionalis under industrial aquaculture condition, one month old juvenile Thamnaconus septentrionalis was taken as an experiment sample for cultivation of 9 months under sea water temperature of 11.08℃~26.32℃. The results indicated that: the initial average body weight and average total length of the sample increased from (0.07±0.02)g and (1.59±0.33)cm to (143.20±10.32)g and (20.31±0.67)cm respectively, with the maximum average weight gain of (44.15±5.74)g/month and daily average weight gain of (0.48±0.04)g/d. There was a linear relationship between the total length and age of days: L= 0.0 693 x + 0.3 017 (R2= 0.9468), with the instantaneous growth rate of average total length being 0.008. There was an exponential relationship between body weight and total length, i.e., regression equation: W= 0.014L3.0479 (R2 = 0.996 8), with the power exponent approximate to 3.0, which indicated an isogony; both the first dorsal fin length and body height had a linear relationship with the total length. The growth condition of the experiment sample was greatly influenced by the temperature, with the increment of body weight high at 18.52~26.32℃. The study indicated that Thamnaconus septentrionalis should be cultured in warm water for rapid growth, and presents a promising prospect for development.