Background: Noninvasive assessment of pulmonary artery systolic pressure by Doppler echocardiography (sPAPECHO) has been widely adopted to screen for pulmonary hypertension (PH). But high proportion of overestimation or underestimation of sPAPECHO still remained. So we aimed to explore the accuracy and influencing factors of sPAPECHO with right heart catheterization (RHC) as reference. Methods: A total of 218 highly suspected pulmonary hypertension (PH) patients who underwent RHC and echocardiography within 7 days were included. The correlation and consistency between tricuspid regurgitation (TR) derived parameters and RHC results were tested by Pearson and Bland-Altaman methods. With mPAP ≥25mmHg measured by RHC as the standard diagnostic criteria of PH, ROC curve was used to compared the diagnostic efficacy of sPAPECHO with other TR related methods. The ratio of (sPAPECHO-sPAPRHC)/sPAPRHC was calculated and divided into three groups, namely, the underestimation group, accurate group and overestimation group by ±10% as the boundary. The influencing factors of sPAPECHO were analyzed by ordinal regression analysis.Results: sPAPECHO had the greatest correlation coefficient (r=0.781, P<0.001), best diagnostic efficiency (AUC=0.98) and lowest bias (mean bias= 0.07mmHg, 95% limits of agreement: -32.08 to +32.22mmHg) compared with other TR related methods. Ordinal regression analysis showed that TR signal quality, PAWP and sPAPRHC level affected the accuracy of sPAPECHO (P < 0.05). The OR value of PAWP was 0.94 (95%CI: 0.89, 0.99). Compared with high sPAPRHC level, the OR value of low and medium sPAPRHC level were 21.56 (95%CI: 9.57, 48.55) and 5.13 (95%CI: 2.55, 10.32) , respectively. Relative to the signal quality of type A, the OR value of type B and C signal quality were 0.26 (95%CI: 0.14, 0.48) and 0.23 (95%CI: 0.07, 0.73), respectively. While TR severity and right ventricular systolic function had no significant effect on the accuracy of sPAPECHO. Conclusions: sPAPECHO was superior to other TR-related methods in PH screening, and was often overestimated in patients with pre-capillary PH at low sPAPRHC level, even with good TR signal quality.Trial registration: This is a retrospectively registered study.