〔Abstract〕 Objective To investigate the correlation between serum bicarbonate level and cardiovascular events in peritoneal dialysis(PD) patients. Methods The data of PD patients who underwent PD catheterization and were followed up regularly until March 31, 2023 were retrospectively collected. The included patients were divided into low bicarbonate group and normal bicarbonate group according to the time-averaged serum bicarbonate level. The incidence of cardiovascular events(including coronary heart disease, heart failure, stroke, peripheral vascular disease, death related to cardiovascular surgery or death due to aneurysm dissection or rupture, fatal pulmonary embolism, or death from other or unknown cardiovascular causes) was compared between the two groups and the risk factors for cardiovascular events were analyzed. Results At the end of follow-up, a total of 110 PD patients were included, and 34 patients had cardiovascular events. Compared with the normal bicarbonate group, the low bicarbonate group had a higher incidence of cardiovascular events. Univariate Cox regression analysis showed that the risk of cardiovascular events in the low bicarbonate group was 4.197 times higher than that in the normal bicarbonate group(95%CI=2.115-8.331,P<0.001). After adjusting for multiple confounding factors, the risk of cardiovascular events in the low bicarbonate group was 3.506 times higher than that in the normal bicarbonate group(95%CI=1.709-7.193,P=0.001). The results of multivariate competing risk model showed that the risk of cardiovascular events in the low bicarbonate group was 3.801 times higher than that in the normal bicarbonate group(95%CI=1.920-7.525,P<0.001). Conclusion Low serum bicarbonate level is closely related to the occurrence of cardiovascular events in patients with PD, and it is an independent risk factor for cardiovascular events in patients with PD.