Objective The weight of 11 kinds of organ and body weight in 75 Mongolian gerbils were mensurated in order to study and build biology indexes system of main organs in Mongolian gerbils and provide the parameters for animal experiments. Methods 38 female and 37 male Mongolian gerbils aged 2-3 months were selected and their body weight and main organ weight were separately weighed, and the data were analyzed in statistics.Results There were no significant differences in main organ weight by sexes( P >0 05),and the growth of main organs of animal community was in a good harmony through the analysis of Kendall coefficient. The linear analysis about body weight and organs showed there were obvious linear relations except thymus,thyroid,brain and testis.Conclusions There are no significant differences in the main organ weight of Mongolian gerbils aged 2-3 months by sexes, and whether there is linear relation between body weight and organs lies on different organs.