Aim ToconstructHEK293cellsstablyex-pressing corticotropin releasing factor receptor 1 ( CRFR1 ) , and evaluate its function by the cAMP as-say.Methods CulturedHEK293cellsweretransfect-ed with CRFR1-expressing vector by Lipofectamine 2000 and were selected by using G418 . CRFR1 ex-pression was detected by Western blot, RT-PCR and immunofluorescence.Results Westernblot,RT-PCR and immunofluorescence data revealed that the HEK293 cells expressed CRFR1 protein stably. The dose-responsive relationship experiment revealed that CRF induced a CRFR1-mediated cAMP production in HEK293 cells with EC50 =(5. 64 ± 0. 05) × 10 -10 mol ·L-1.Conclusion HEK293celllinesstablyex-pressing CRFR1 were constructed successfully, which would provide a cellular model to facilitate the research on the biological function of CRFR1 and CRFR1-targe-ted drug screening.