Objective Using detection data of clinically suspected CTPA patients with acute pulmonary embolism, evaluation of patients with ventricular size and transthoracic echocardiography Beckoning diagram (TTE) to check the results of the analysis of consistency and correlation, to explore the feasibility and accuracy of CTPA in the evaluation of right Hventricular function. Methods 90 cases of patients with suspected pulmonary embolism, among them 50 patients received TTE examination before and after CTPA examination 1D. All patients were using 128 slice spiral CT for CTPA examination. Using a two-dimensional measurement evaluation of ventricular size: axial ventricular diameter (LVtrans, RVtrans); reconstruction of four chamber a ventricular diameter (LV4ch, RVtrans) and calculated the corresponding ventricular parameters (RV/LVtrans, RV/ LV4ch) ratio. The assessment of ventricular size in TTE image using the corresponding parameters: end diastolic left ventricular internal diameter (LVTTE), end diastolic diameter of right ventricle (RVTTE) and the calculated ventricular diameter ratio (RV/LVTTE). Consistency and correlation by using the above data evaluation of CTPA and TTE results. Results RVtrans and RVTTE showed no significant correlation (P>0.05), LVtrans is positively correlated with LVTTE (r=0.56, P<0.01). RV4ch was positive correlation with RVTTE (r=0.37, P<0.01). LV4ch was positive correlation with LVTTE (r=0.48, P<0.01). CTPA and TEE measured with statistical difference between ventricular diameter (P<0.01, P<0.05). RV/LV4ch, RV/LVtrans and RV/LVTTE correlation analysis, shows no direct correlation between the groups (P>0.05), with significant difference between the diameter ratio (P<0.01). Conclusion CTPA is a simple method for evaluation of ventricular size, and the actual measured value with TTE and consistent correlation. The value of two-dimensional in between with consistency and better correlation. But no significant correlation between two-dimensional ratio. CTPA volume ratio and TTE ratio had no correlation with 2D, but the better consistency.