Abstract: S[Objective][Method]The age structure and growth characteristics of Paramisgurnus dabryanus, an alien species in the Cha Balang wetland, were investigated to provide the basic parameters to control the invasion of alien fish species including P. dabryanus in Tibet effectively. The otoliths of 299 specimens of P. dabryanus were used as identification materials in this study. [Result]The results showed that the body length of P. dabryanus ranged from 5.13 to 16.92 cm, the body weight ranged from 1.22 to 49.89 g, and there were 8 groups of age ranging from 2 to 8 years old, while the dominant age group ranged from 4 to 6 years old. Correlation analysis showed that there was no significant difference between male and female body lengths and body weights. The related expression of body weight and body length was W = 0.010L_2.917, displaying uniform growth model. The Logistic equation of length growth and weight growth are Lt = 12.740 / (1 + e_{0.803-0.530 * t}), Wt = 16.740 / (1 + e_{0.803-0.530 * t}) _2.917, respectively. The inflection point age of P. dabryanus researched in this study was 3.5 years old, while the corresponding body length and body mass were 9.44 cm and 6.99 g respectively. [Conclusion] For the age structure, threre are more older individuals among P. dabryanus population in the Cha Balang wetland when comparing with the corresponding population in plain area. The growth characteristics were characterized by an individual decrease and a decrease in the growth index. These changes may be caused by the alien species in order to better adapt to Plateau low temperature water environment.