[Aim]  To clarify the behavioral characteristics of the larvae and adults of Tuta absoluta, and provide new insights for developing integrated management strategies to control this pest. [Methods]  A laboratory-reared population of T. absoluta was used to study larval behavioral traits such as hatching, leaf-mining, and pupation, as well as the effects of low population density on larval growth and development. In addition, adult mating, oviposition preferences and behavioral rhythms, were observed. [Results]  The average hatching process of T. absoluta larvae lasted 5 min, with no subsequent consumption of eggshells by larvae observed. After hatching, larvae immediately began leaf-mining near the leaf veins. Under environmental stress, larvae relocated to suitable leaves to resume mining. The average leaf area loss was 2.86 cm² per larva. Under low population density conditions, significant differences were observed in adult fecundity (P < 0.05) and female adult longevity (P < 0.05) following larval development at varying population densities. Adults exhibited multiple mating behaviors. Female adults preferred ovipositing on the abaxial side of leaves in the lower parts of the plant. The average oviposition period was 15 d, with peak egg-laying occurring at 2-3 d of age. The highest oviposition rate was observed 30-36 h after eclosion. [Conclusion]  T. absoluta larvae do not consume their eggshell after hatching, and damage an average leaf area of 2.86 cm² per larva. Larval densities < 8 individuals per leaf do not affect larval development, female fecundity, or adult longevity. Female adults have an average oviposition period of 15 days, with the peak of egg-laying occurring on the 2nd to 3rd day.