Objective: To investigate the effects of quercetin on microcirculation and liver lesions in cirrhotic rats based on Bcl-2/CytC regulatory network. Methods: Forty-five clean SD rats were selected and divided into group A, LC group, QUE Low group, QUE High group, ETV group, 10 rats per group by random number table method. Liver cirrhosis model was established except for 10 healthy rats. QUE Low group was given quercetin 50 mg/kg intragastric administration. QUE High group was given quercetin 100 mg/kg intragastric administration, ETV group was given Entecavir dispersible tablets 0.5 mg/time intragastric administration, group A and LC were given normal saline intragastric administration, once A day, for A total of 14 days. The levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), total cholesterol (TC), triglyceride (TG) and the contents of thrombin A2 (TXA2), angiotensin II (Ang ii) and prostacyclin (PGI2) in serum of rats were detected by ELISA. Liver morphology of each group was compared by HE staining. West- ern blotting was used to detect the expression of bcl-2, Bax and cytochrome C (CytC) proteins in rat liver tissue. Results: Compared with A group, ALT, AST, TC, TG, TXA2 and AngII expressions were higher in LC group, while PGI2, CytC and Bax were lower (P<0.05). Compared with LC group, ALT, AST, TC, TG, TXA2 and AngII in QUE Low group were decreased, while PGI2, CytC and Bax were increased (P<0.05). Compared with QUE Low group, ALT, AST, TC, TG, TXA2 and Angll of ETV group decreased, while PGI2, CytC and Bax increased (P<0.05). Compared with ETV group, ALT, AST, TC, TG, TXA2 and Angll in QUE High group were decreased, while PGI2, CytC and Bax were increased (P<0.05). The liver tissues of group A were intact. The liver tissue of LC group rats was severely damaged. QUE Low group rats still had fibrous tissue hyperplasia and inflammatory infiltration in liver interstitium. ETV group still had hepatocyte degeneration and inflammatory factors. In QUE High group, the degeneration reaction of liver tissue and inflammation of portal area were decreased. Compared with A group, LC group had obvious liver fibrosis, liver cell degeneration and necrosis and inflammatory cell infiltration (P<0.05). Compared with LC group, liver fibrosis was alleviated in QUE Low group (P<0.05); Compared with QUE Low group, liver fibrosis, degeneration necrosis and inflammatory cell infiltration were alleviated in ETV group (P<0.05). Compared with ETV group, liver fibrosis, degeneration necrosis and inflammatory cell infiltration were improved in QUE High group (P<0.05). Conclusion: Quercetin has a protective effect on liver tissue of cirrhotic rats, improving liver function, liver microcirculation and liver lesions, and its mechanism may regulate bcl-2, Bax, CytC and other related proteins. [ABSTRACT FROM AUTHOR]