Abstract: This research aims at the relationship between age and body weight, oviduct weight of Rana chensinensis. The data of body weight and oviduct weight of Rana chensinensis (n=429) were analyzed with the clustering statistics analysis by SPSS 18.0 software, and the age groups of Rana chensinensis were preliminarily divided. The femur of randomly selected Rana chensinensis with different body weights and oviduct weights was sliced with paraffin section method. The age of Rana chensinensis was identified through observing the number of the growth ring lines on the cross-section of the femur. The result of cluster analysis was verified. We found that the frogs could be divided into five age groups using the cluster analysis and the femur slice test could accurately classify 1-4 age of Rana chensinensis. The body weight of 1-year-old Rana chensinensis ranged from 15.56 to 21.95 g and the oviduct weight ranged from 0.45 to 1.01 g. The body weight of 2-year-old Rana chensinensis ranged from 21.13 to 35.78 g and the oviduct weight ranged from 0.98 to 1.74 g. The body weight of 3-year-old Rana chensinensis ranged from 29.18 to 43.91 g and the oviduct weight ranged from 1.52 to 2.45 g. The body weight of 4-year-old Rana chensinensis ranged from 40.00 to 54.75 g and the oviduct weight ranged from 2.17 to 2.96 g. The study indicates that the age of Rana chensinensis can be judged by the body weight and oviduct weight.