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Objective To investigate the androgen receptor (AR) mRNA expression in pancreas,hypothalamus and ovary of androgen sterilized rats (ASR)Methods ASR model was established by subcutaneous injection of testosterone propionate to SD female rats at the age of 9 days. Around the age of 106 days (proestrus),all rats were killed, serum △ 4-andronestedione (△ 4-A), total testosterone (TT), free testosterone (FT), insulin (Ins) and C-peptide (C-P)were measured by radioimmunoassay (RIA). Total RNA in pancreas, hypothalamus and ovary were extracted and the amount of AR mRNA was quantitatedly analyzed by RT-PCR with single base mutant template as inner standard.Results Serum concentrations of△ 4-A, TT, FT, Ins and C-P in ASR model rats were significantly higher than those in control group (P＜0. 05, P＜0. 01). The expression of AR mRNA in pancreas, hypothalamus and ovary increased significantly (P＜0. 05,P＜0. 01) of model rats as compared with control group.Conclusion The elevated serum androgen levels in ASR model could enhance the expression of AR mRNA levels in pancreas, hypothalamus and ovary, which further induce hyperinsulinemia and anovulation.