〔Abstract〕 Objective To analyze the effects of fluid management based on bedside ultrasound on postoperative blood gas analysis and organ function in patients with severe gestational hypertensive during pregnancy (HDCP). Methods 29 patients with severe HDCP heart disease admitted to the intensive care unit of the First Affiliated Hospital of Bengbu Medical College from January 2018 to March 2020 were selected as study subjects, and they were randomly divided into control group with 13 cases and observation group with 16 cases, the control group used conventional fluid management methods, and the observation group used fluid management methods based on bedside ultrasound ,Comparing the blood gas index and organ function of the two groups after management. Results Heart rate (HR), respiratory frequency (RR) and mean arterial pressure (MAP) after 3 day of liquid management in the two groups were lower than before liquid management, and the HR and RR of the observation group were significantly lower than that of the control group (P < 0.05). The arterial blood oxygen partial pressure (PaO2), arterial blood carbon 2 partial pressure (PaCO2), oxygenation index (OI) increased significantly in the two groups, and the improvement in the observed group was better than the control group (P < 0.05).The sequential organ failure (SOFA) scores of the two groups decreased after 3 days, and the SOFA score of the observation group was lower than that of the control group after 3 days (P < 0.05). Conclusion Fluid management based on bedside ultrasound can significantly improve the vital signs and blood gas analysis results of postoperative patients with HDCP, and reduce the degree of damage to organ function.