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Objective To study the association between mean platelet volume（MPV），platelet distribution width（PDW） and procalcitonin（PCT） and cardiac function in patients with pulmonary hypertension（PH） and their diagnostic value on heart failure. Methods　103 patients with PH（ PH group） in the 3rd People's Hospital of Chengdu from October 2021 to October 2022 and 103 healthy subjects with physical examination（control group）were selected as study subjects. Fasting peripheral venous blood was collected on the 1st day of admission and MPV， PDW and PCT were detected. The left ventricular ejection fraction（LVEF） was measured and the cardiac function was evaluated by New York Heart Association（NYHA） grading criteria. The patients with PH were divided into failure group and non-failure group according to the diagnosis results of heart failure. The relations of MPV, PDW and PCT with cardiac function in patients with PH and the diagnostic value on heart failure were analyzed. Results The levels of MPV, PDW, and PCT were all higher in the experimental group compared to the control group, while the LVEF was lower, and these differences were statistically significant（ P < 0.05） ； as the NYHA classification increased, the levels of MPV，PDW, and PCT showed an increasing trend, while LVEF showed a decreasing trend, and the differences between the groups were statistically significant（ P < 0.05）；in the heart failure group n = 65，the levels of MPV, PDW, and PCT were higher compared to the non-heart failure group n = 38，while LVEF was lower, and these differences were statistically significant（P< 0.05）. The levels of MPV, PDW, and PCT werr significantly positively correlated with NYHA functional classification and LVEF（P < 0.05）. The levels of MPV, PDW, and PCT had good reference value for the diagnosis of heart failure in PH patients, with AUC values of 0.816, 0.897, and 0.825 respectively, and the combined diagnostic AUC is 0.952，which was statistically different from the application of the three indicators alone（P < 0.05）. Conclusion　RDW，PDW and PCT are closely related to cardiac function in patients with PH, and can provide reference information for diagnosis and treatment of heart failure in patients with PH. [ABSTRACT FROM AUTHOR]