Objective:To observe the efficacy and safety of olaparib combined with bevacizumab in patients with recurrent platinum-sensitive ovarian cancer, and the effect on serum levels of human epididymis protein 4 (HE4), carbohydrate antigen 125 (CA125) and circulating tumor cells (CTCs).Methods:A total of 96 patients with recurrent platinum-sensitive ovarian cancer admitted to Dongfeng Hospital Affiliated to Hubei Medical College from June 2018 to June 2019 were selected and divided into control group ( n=48) and study group ( n=48) according to the random number table method. The control group was given doxorubicin liposomes combined with carboplatin chemotherapy for 6 cycles, and the study group was given olaparib combined with bevacizumab, continuous olaparib, and bevacizumab for 6 cycles. The median progression-free survival (PFS), the objective effective rate (ORR), disease control rate (DCR) of the two groups were evaluated, the changes of serum HE4, CA125 and CTCs levels of the two groups after treatment were compared, and the adverse drug reactions of patients during treatment were observed. Results:The median PFS of the study group was 8.3 months, which was longer than 5.5 months of the control group, with a statistically significant difference ( χ2=5.134, P=0.025). The ORR and DCR of the study group were 52.08% (25/48) and 81.25% (39/48), which were significantly higher than 31.25% (15/48) and 62.50% (30/48) of the control group, with statistically significant differences ( χ2=4.286, P=0.038; χ2=4.174, P=0.041). After 6 cycles treatment, serum HE4 [(123.60±31.52) pmol/L vs. (178.01±46.22) pmol/L], CA125 [(33.52±10.61)U/L vs. (50.32±11.09) U/L] and CTCs [(2.19±0.24) pcs/5 ml vs. (3.25±0.31) pcs/5 ml] of the study group were significantly lower than those of the control group, with statistically significant differences ( t=8.489, P=0.025; t=7.562, P=0.032; t=9.341, P=0.017). The incidences of gastrointestinal reactions [35.42% (17/48) vs. 64.58% (31/48)], bone marrow suppression [18.75% (9/48) vs. 41.67% (20/48)], liver and kidney function damage [2.08% (1/48) vs. 14.58% (7/48)], cardiotoxicity [4.17% (2/48) vs. 18.75% (9/48)], allergy reaction [0 (0) vs. 8.33% (4/48)], neurotoxicity [2.08% (1/48) vs. 16.67% (8/48)] and other adverse reactions of the study group were significantly lower than those of the control group, with statistically significant differences ( χ2=8.167, P=0.004; χ2=7.584, P=0.006; χ2=4.909, P=0.027; χ2=5.031, P=0.025; χ2=4.174, P=0.041; χ2=6.008, P=0.014). Conclusion:For patients with recurrent platinum-sensitive ovarian cancer, olalapril combined with bevacizumab has better curative effect than doxorubicin liposome combined with carboplatin chemotherapy, and can prolong the survival period of patients, down-regulate serum HE4, CA125 and CTCs levels, with low incidence of adverse reactions.