Objective To explore the changed rules and the diagnositic methods of the cardisc functions after chest impact trauma(CIT).Methods The medals of moderate to severity CIT were established using BIM-Ⅱ Bio-impactor in 20 rabbits.The cardiac functions were examined with cardiac catheterization,single photon-emission computed tomography(SPECT)and the Doppler echocardiography at pre end post 1h,4h,8h and 24h after CIT.Results The cardiac functions were changed significantly after CIT.The expressions of the right ventricular dysfunctions mainly were systolic dysfuction while the left ventricular dysfunctions mainly were diastolic dysfunction after CIT.Conclustion All the cardiac catheterization、SPECT and the Doppler echocardiography are beneficial to the diagnosis of cardiac dysfunction afte CIT.The SPEGT is more exactitude and the Doppler echocardiography is more cheaper compared with non-invasive approaches.