Objective To assess the clinic value of transthoracic echocardiography in diagnosis of infective endocarditis.Methods Transthoracic echocardiography features and clinic data of 114 patients with infective endocarditis were analyzed retrospectively.The form,activity and coaptation of cardiac valve were observed.The vegetation was found,and the surrounding structure of valve and fundamental heart disease were studied.Results Among 114 patients,the primary symptom presented as fever in 104 patiens.Fundamental heart disease was found in 69 patients;and systemic disease was found in 5 patients.Blood culture was positive in 35 patients.Mitral valve was involved in 46 patients.Aortic valve was involved in 48 patients.Tricuspid valve was involved in 17 patients.Pulmonary valve was involved in 1 patient.Prosthetic valve was infected in 9 patients.Multi-valves were infected in 7 patients.There were serious complications in 19 patients.Ultrasound showed vegetation in 56 of 59 patients underwent surgery.And the diagnostic accuracy rate was 94.92％ (56/59).Conclusion Transthoracic echocardiography can be used to accurately diagnose infective endocarditis.