Objective To investigate the effects of aerobic respiratory training on cardiopulmonary function and hemorheology in patients with chronic pulmonary heart disease(CPHD).Methods A total of 92 CPHD patients treated at our hospital from January 2022 to June 2024 were enrolled as study subjects.They were randomly divided into a control group and a study group using a random number table method,with 46 patients in each group.The control group was treated with conventional therapy,while the study group under-went a standardized aerobic respiratory training program on top of the control group's treatment.Cardiac function indicators,pulmonary function parameters,clinical symptom scores,hemorheological indexes,quality of life,adverse reactions,and treatment efficacy were compared between the two groups.Results After treat-ment,the study group exhibited significantly lower left ventricular end-diastolic dimension(LVEDD),left ventricular end-systolic dimension(LVESD),clinical symptom scores,hematocrit,fibrinogen,high-shear whole blood viscosity,and low-shear whole blood viscosity compared to the control group(P<0.05).Con-versely,left ventricular ejection fraction(LVEF),6-minute walk distance(6MWD),maximal voluntary venti-lation(MVV),forced expiratory volume in 1 second(FEV1),forced vital capacity(FVC),scores on the ge-neric quality of life inventory-74(GQOLI-74),and overall treatment efficacy were significantly higher in the study group(P<0.05).No statistically significant differences were observed in the incidence of adverse reac-tions between the two groups(P>0.05).Conclusion Aerobic respiratory training effectively improves car-diopulmonary function,clinical symptoms,hemorheological profiles,and quality of life in patients with CPHD.