Abstract： Objective To evaluate the influence of SP600125,a selective c-Jun N-terminal kinase (JNK) inhibitor,on the levels of serum total bile salt (TBA) and Bsep,Ntcp expression in the hepatic tissue of rats with ethinylestradiol induced intrahepatic cholestasis.Methods Rats pregnant for 15days were administered the subcutaneous injection of 17- b -estradiol propylene ( EE ) to modulate the ICP animal models,and be SP600125 to intervene.Testing the level of serum TBA and the expression of c-Jun,Bsep,Ntcp in the hepalatic tissue.Results The average gray values of c-Jun in the group of ICP models were significantly lower than the normal control group ( 101.05 ± 5.20 vs 118.99 ± 5.95,P ＜ 0.05 ).After the intervention of SP600125,comparing with the group of ICP models,the expression of Bsep,Ntcp in the group of SP600125 intervention were significantly higher,and this change in the high dose of SP600125 intervention group was more obvious ( low dose intervention group Bsep:0.452 ±0.031 vs 0.291 ±0.043,Ntcp:0.462 ± 0.015 vs 0.285 ± 0.021,P ＜ 0.05 ; high dose intervention group Bsep:0.568 ± 0.038 vs 0.291 ±0.043,Ntcp:0.605±0.020 vs 0.285 ±0.021,P ＜0.05),while the level of TBA in the serum was significantly lower.Conclusions Treatment with SP600125 can down-regulate the level of c-Jun/AP-1,and it may participate in the lower expression of Bsep、Ntcp in the ICP rats which were induced by 17-bestradiol.